Provided by: libtiff-dev_4.5.0-5ubuntu1_amd64 
NAME
libtiff - introduction to libtiff, a library for reading and writing TIFF files
SYNOPSIS
#include <tiffio.h>
cc file.c -ltiff
DESCRIPTION
libtiff is a library for reading and writing data files encoded with the "Tag Image File"
format, Revision 6.0 (or revision 5.0 or revision 4.0). This file format is suitable for
archiving multi-color and monochromatic image data.
The library supports several compression algorithms, as indicated by the Compression
field, including: no compression (1), CCITT 1D Huffman compression (2), CCITT Group 3
Facsimile compression (3), CCITT Group 4 Facsimile compression (4), Lempel-Ziv & Welch
compression (5), baseline JPEG compression (7), word-aligned 1D Huffman compression
(32771), PackBits compression (32773). In addition, several nonstandard compression
algorithms are supported: the 4-bit compression algorithm used by the ThunderScan program
(32809) (decompression only), NeXT's 2-bit compression algorithm (32766) (decompression
only), an experimental LZ-style algorithm known as Deflate (32946), and an experimental
CIE LogLuv compression scheme designed for images with high dynamic range (32845 for LogL
and 32845 for LogLuv). Directory information may be in either little- or big-endian byte
order; byte swapping is automatically done by the library. Data bit ordering may be either
Most Significant Bit (MSB) to Least Significant Bit (LSB) or LSB to MSB. Finally, the
library does not support files in which the BitsPerSample , Compression , MinSampleValue ,
or MaxSampleValue fields are defined differently on a per-sample basis (in Rev. 6.0 the
Compression tag is not defined on a per-sample basis, so this is immaterial).
DATA TYPES
The library makes extensive use of C typedefs to promote portability. Two sets of
typedefs are used, one for communication with clients of the library and one for internal
data structures and parsing of the TIFF format. The following typedefs are exposed to
users either through function definitions or through parameters passed through the varargs
interfaces.
typedef uint32_t ttag_t; // directory tag
typedef uint32_t tdir_t; // directory index
typedef uint16_t tsample_t; // sample number
typedef uint32_t tstrip_t; // strip number
typedef uint32_t ttile_t; // tile number
typedef int64_t tmsize_t; // signed size type (int32_t on 32-bit platforms)
typedef tmsize_t tsize_t; // i/o size in bytes
typedef void* tdata_t; // image data ref
typedef void* thandle_t; // client data handle
typedef uint64_t toff_t; // file offset
Note that tstrip_t, ttile_t, and tsize_t are constrained to be no more than 32-bit
quantities by 32-bit fields they are stored in in the TIFF image. Likewise tsample_t is
limited by the 16-bit field used to store the SamplesPerPixel tag.
tdir_t constrains the maximum number of IFDs that may appear in an image and may be an
arbitrary size (w/o penalty). Starting with libtiff 4.5.0, tdir_t is a 32-bit unsigned
integer. Previously, it was a 16-bit unsigned integer.
ttag_t must be either int, unsigned int, pointer, or double because the library uses a
varargs interface and C restricts the type of the parameter before an ellipsis to be a
promoted type. toff_t is defined as uint64_t because TIFF file offsets are (unsigned)
32-bit quantities, and BigTIFF file offsets are unsigned 64-bit quantities. A signed
value is used because some interfaces return -1 on error. Finally, note that
user-specified data references are passed as opaque handles and only cast at the lowest
layers where their type is presumed.
LIST OF ROUTINES
The following routines are part of the library. Consult specific manual pages for details
on their operation; on most systems doing man function-name will work.
LIBTIFF FUNCTIONS
┌───────────────────────────────────────┬──────────────────────────────────┐
│Name │ Description │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFAccessTagMethods() │ provides read/write access to │
│ │ the TIFFTagMethods within the │
│ │ TIFF structure to application │
│ │ code without giving access to │
│ │ the private TIFF structure │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFCheckpointDirectory() │ writes the current state of the │
│ │ directory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFCheckTile() │ very x,y,z,sample is within │
│ │ image │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFCIELabToRGBInit() │ initialize CIE L*a*b* 1976 to │
│ │ RGB conversion state │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFCIELabToXYZ() │ perform CIE L*a*b* 1976 to CIE │
│ │ XYZ conversion │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFCleanup() │ auxiliary function to free the │
│ │ TIFF structure │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFClientdata() │ return open file's clientdata │
│ │ handle, which represents the │
│ │ file descriptor used within │
│ │ libtiff. │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFClientOpen() │ open a file for reading or │
│ │ writing │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFClientOpenExt() │ open a file for reading or │
│ │ writing with options, such as │
│ │ re-entrant error and warning │
│ │ handlers may be passed │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFClose() │ close a previously opened TIFF │
│ │ file │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFComputeStrip() │ return strip containing y,sample │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFComputeTile() │ return tile containing │
│ │ x,y,z,sample │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFCreateCustomDirectory() │ setup for a custom directory in │
│ │ a open TIFF file │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFCreateDirectory() │ setup for a directory in a open │
│ │ TIFF file │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFCreateEXIFDirectory() │ setup for a EXIF custom │
│ │ directory in a open TIFF file │
│ │ within a TIFF tag │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFCreateGPSDirectory() │ setup for a GPS custom directory │
│ │ in a open TIFF file within a │
│ │ TIFF tag │
└───────────────────────────────────────┴──────────────────────────────────┘
│TIFFCurrentDirectory() │ return index of current │
│ │ directory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFCurrentDirOffset() │ return file offset of the │
│ │ current directory (instead of an │
│ │ index) │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFCurrentRow() │ return index of current scanline │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFCurrentStrip() │ return index of current strip │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFCurrentTile() │ return index of current tile │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFDataWidth() │ return the size of TIFF data │
│ │ types │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFDefaultStripSize() │ return number of rows for a │
│ │ reasonable-sized strip according │
│ │ to the current settings of the │
│ │ ImageWidth, BitsPerSample and │
│ │ SamplesPerPixel, tags and any │
│ │ compression-specific │
│ │ requirements │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFDefaultTileSize() │ return pixel width and height of │
│ │ a reasonable-sized tile; │
│ │ suitable for setting up the │
│ │ TileWidth and TileLength tags │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFDeferStrileArrayWriting() │ is an advanced writing function │
│ │ to control when/where the │
│ │ [Strip/Tile][Offsets/ByteCounts] │
│ │ arrays are written into the │
│ │ file, and must be used in a │
│ │ particular sequence together │
│ │ with │
│ │ TIFFForceStrileArrayWriting() │
│ │ (see description) │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFError() │ library-wide error handling │
│ │ function printing to stderr │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFErrorExt() │ user-specific library-wide error │
│ │ handling function that can be │
│ │ passed a file handle, which is │
│ │ set to the open TIFF file within │
│ │ libtiff │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFErrorExtR() │ user-specific re-entrant library │
│ │ error handling function, to │
│ │ which its TIFF structure is │
│ │ passed containing the pointer to │
│ │ a user-specific data object │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFdOpen() │ open a file for reading or │
│ │ writing │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFdOpenExt() │ open a file for reading or │
│ │ writing with options, such as │
│ │ re-entrant error and warning │
│ │ handlers may be passed │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFieldDataType() │ get data type from field │
│ │ information │
└───────────────────────────────────────┴──────────────────────────────────┘
│TIFFFieldIsAnonymous() │ returns if field was unknown to │
│ │ libtiff and has been │
│ │ auto-registered │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFieldName() │ get field name from field │
│ │ information │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFieldPassCount() │ get whether to pass a value │
│ │ count to Get/SetField │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFieldReadCount() │ get number of values to be read │
│ │ from field │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFieldSetGetCountSize() │ returns size of count parameter │
│ │ of TIFFSetField() and │
│ │ TIFFGetField() │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFieldSetGetSize() │ return data size in bytes of the │
│ │ field data type used for libtiff │
│ │ internal storage. │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFieldTag() │ get tag value from field │
│ │ information │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFieldWithName() │ get field information given │
│ │ field name │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFieldWithTag() │ get field information given tag │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFieldWriteCount() │ get number of values to be │
│ │ written to field │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFileName() │ return name of open file │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFileno() │ return open file descriptor │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFindCODEC() │ find standard codec for the │
│ │ specific scheme │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFindField() │ get field information given tag │
│ │ and data type │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFlush() │ flush all pending writes │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFlushData() │ flush pending data writes │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFForceStrileArrayWriting() │ is an advanced writing function │
│ │ that writes the │
│ │ [Strip/Tile][Offsets/ByteCounts] │
│ │ arrays at the end of the file │
│ │ (see description) │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFFreeDirectory() │ release storage associated with │
│ │ a directory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetBitRevTable() │ return bit reversal table │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetClientInfo() │ returns a pointer to the data of │
│ │ the named entry in the │
│ │ clientinfo-list │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetCloseProc() │ returns a pointer to file close │
│ │ method │
└───────────────────────────────────────┴──────────────────────────────────┘
│TIFFGetConfiguredCODECs() │ gets list of configured codecs, │
│ │ both built-in and registered by │
│ │ user │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetField() │ return tag value in current │
│ │ directory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetFieldDefaulted() │ return tag value in current │
│ │ directory with default value set │
│ │ if the value is not already set │
│ │ and a default is defined │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetMapFileProc() │ returns a pointer to memory │
│ │ mapping method │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetMode() │ return open file mode │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetReadProc() │ returns a pointer to file read │
│ │ method │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetSeekProc() │ returns a pointer to file seek │
│ │ method │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetSizeProc() │ returns a pointer to file size │
│ │ requesting method │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetStrileByteCount() │ return value of the │
│ │ TileByteCounts/StripByteCounts │
│ │ array for the specified │
│ │ tile/strile │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetStrileByteCountWithErr() │ same as TIFFGetStrileByteCount() │
│ │ and additionally provides an │
│ │ error return │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetStrileOffset() │ return value of the │
│ │ TileOffsets/StripOffsets array │
│ │ for the specified tile/strile │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetStrileOffsetWithErr() │ same as TIFFGetStrileOffset() │
│ │ and additionally provides an │
│ │ error return │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetTagListCount() │ return number of entries in the │
│ │ custom tag list │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetTagListEntry() │ return tag number of the (n.th - │
│ │ 1) entry within the custom tag │
│ │ list │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetUnmapFileProc() │ returns a pointer to memory │
│ │ unmapping method │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetVersion() │ return library version string │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFGetWriteProc() │ returns a pointer to file write │
│ │ method │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFIsBigEndian() │ returns a non-zero value if the │
│ │ file is BigEndian and zero if │
│ │ the file is LittleEndian │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFIsBigTIFF() │ returns a non-zero value if the │
│ │ file is in BigTIFF style │
└───────────────────────────────────────┴──────────────────────────────────┘
│TIFFIsByteSwapped() │ return true if image data is │
│ │ byte-swapped │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFIsCODECConfigured() │ check, whether we have working │
│ │ codec │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFIsMSB2LSB() │ return true if image data is │
│ │ being returned with bit 0 as the │
│ │ most significant bit │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFIsTiled() │ return true if image data is │
│ │ tiled │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFIsUpSampled() │ returns a non-zero value if │
│ │ image data returned through the │
│ │ read interface Routines is being │
│ │ up-sampled │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFLastDirectory() │ returns a non-zero value if the │
│ │ current directory is the last │
│ │ directory in the file; otherwise │
│ │ zero is returned │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFMergeFieldInfo() │ adds application defined TIFF │
│ │ tags to the list of known │
│ │ libtiff tags │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFNumberOfDirectories() │ return number of directories in │
│ │ a file │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFNumberOfStrips() │ return number of strips in an │
│ │ image │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFNumberOfTiles() │ return number of tiles in an │
│ │ image │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFOpen() │ open a file for reading or │
│ │ writing │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFOpenExt() │ open a file for reading or │
│ │ writing with options, such as │
│ │ re-entrant error and warning │
│ │ handlers may be passed │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFOpenW() │ opens a TIFF file with a Unicode │
│ │ filename, for read/writing │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFOpenWExt() │ opens a TIFF file with a Unicode │
│ │ filename, for read/writing with │
│ │ options, such as re-entrant │
│ │ error and warning handlers may │
│ │ be passed │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFOpenOptionsAlloc() │ allocates memory for │
│ │ TIFFOpenOptions opaque structure │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFOpenOptionsFree() │ releases the allocated memory │
│ │ for TIFFOpenOptions │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFOpenOptionsSetMaxSingleMemAlloc() │ limits the maximum single memory │
│ │ allocation within libtiff │
└───────────────────────────────────────┴──────────────────────────────────┘
│TIFFOpenOptionsSetErrorHandlerExtR() │ setup of a user-specific and │
│ │ per-TIFF handle (re-entrant) │
│ │ error handler │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFOpenOptionsSetWarningHandlerExtR() │ setup of a user-specific and │
│ │ per-TIFF handle (re-entrant) │
│ │ warning handler │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFPrintDirectory() │ print description of the current │
│ │ directory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFRasterScanlineSize() │ returns the size in bytes of a │
│ │ complete decoded and packed │
│ │ raster scanline │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFRasterScanlineSize64() │ return size as uint64_t │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFRawStripSize() │ return number of bytes in a raw │
│ │ strip │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFRawStripSize64() │ return number of bytes in a raw │
│ │ strip as uint64_t │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadBufferSetup() │ specify i/o buffer for reading │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadCustomDirectory() │ read the custom directory from │
│ │ the given offset and set the │
│ │ context of the TIFF-handle tif │
│ │ to that custom directory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadDirectory() │ read the next directory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadEncodedStrip() │ read and decode a strip of data │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadEncodedTile() │ read and decode a tile of data │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadEXIFDirectory() │ read the EXIF directory from the │
│ │ given offset and set the context │
│ │ of the TIFF-handle tif to that │
│ │ EXIF directory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadFromUserBuffer() │ replaces the use of │
│ │ TIFFReadEncodedStrip() / │
│ │ TIFFReadEncodedTile() when the │
│ │ user can provide the buffer for │
│ │ the input data │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadGPSDirectory() │ read the GPS directory from the │
│ │ given offset and set the context │
│ │ of the TIFF-handle tif to that │
│ │ GPS directory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadRawStrip() │ read a raw strip of data │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadRawTile() │ read a raw tile of data │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadRGBAImage() │ read an image into a fixed │
│ │ format raster │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadRGBAImageOriented() │ works like TIFFReadRGBAImage() │
│ │ except that the user can specify │
│ │ the raster origin position │
└───────────────────────────────────────┴──────────────────────────────────┘
│TIFFReadRGBAStrip() │ reads a single strip of a │
│ │ strip-based image into memory, │
│ │ storing the result in the user │
│ │ supplied RGBA raster │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadRGBAStripExt() │ same as TIFFReadRGBAStrip() but │
│ │ providing the parameter │
│ │ stop_on_error │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadRGBATile() │ reads a single tile of a │
│ │ tile-based image into memory, │
│ │ storing the result in the user │
│ │ supplied RGBA raster │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadRGBATileExt() │ same as TIFFReadRGBATile() but │
│ │ providing the parameter │
│ │ stop_on_error │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadScanline() │ read and decode a row of data │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReadTile() │ read and decode a tile of data │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFRegisterCODEC() │ override standard codec for the │
│ │ specific scheme │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFReverseBits() │ reverse bits in an array of │
│ │ bytes │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFRewriteDirectory() │ operates similarly to │
│ │ TIFFWriteDirectory(), but can be │
│ │ called with directories │
│ │ previously read or written that │
│ │ already have an established │
│ │ location in the file and places │
│ │ it at the end of the file │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFRGBAImageBegin() │ setup decoder state for │
│ │ TIFFRGBAImageGet │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFRGBAImageEnd() │ release TIFFRGBAImage decoder │
│ │ state │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFRGBAImageGet() │ read and decode an image │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFRGBAImageOK() │ is image readable by │
│ │ TIFFRGBAImageGet │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFScanlineSize() │ return size of a scanline │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFScanlineSize64() │ return size of a scanline as │
│ │ uint64_t │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSetClientdata() │ set open file's clientdata (file │
│ │ descriptor/handle), and return │
│ │ previous value │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSetClientInfo() │ adds or replaces an entry in the │
│ │ clientinfo-list │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSetCompressionScheme() │ set compression scheme │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSetDirectory() │ set the current directory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSetErrorHandler() │ set error handler function │
└───────────────────────────────────────┴──────────────────────────────────┘
│TIFFSetErrorHandlerExt() │ set error handler function with │
│ │ a file handle as parameter │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSetField() │ set a tag's value in the current │
│ │ directory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSetFileName() │ sets the file name in the │
│ │ TIFF-structure and returns the │
│ │ old file name │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSetFileno() │ overwrites a copy of the open │
│ │ file's I/O descriptor, and │
│ │ return previous value (refer to │
│ │ detailed description) │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSetMode() │ sets the libtiff open mode in │
│ │ the TIFF-structure and returns │
│ │ the old mode │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSetSubDirectory() │ set the current directory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSetTagExtender() │ is used to register the merge │
│ │ function for user defined tags │
│ │ as an extender callback with │
│ │ libtiff │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSetupStrips() │ setup or reset strip parameters │
│ │ and strip array memory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSetWarningHandler() │ set warning handler function │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSetWarningHandlerExt() │ set warning handler function │
│ │ with a file handle as parameter │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSetWriteOffset() │ set current write offset │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFStripSize() │ return size of a strip │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFStripSize64() │ return equivalent size for a │
│ │ strip of data as uint64_t │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSwabArrayOfDouble() │ swap bytes of an array of │
│ │ doubles │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSwabArrayOfFloat() │ swap bytes of an array of floats │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSwabArrayOfLong() │ swap bytes of an array of longs │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSwabArrayOfLong8() │ swap bytes of an array of │
│ │ uint64_t │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSwabArrayOfShort() │ swap bytes of an array of shorts │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSwabArrayOfTriples() │ swap the first and third byte of │
│ │ each triple within an array of │
│ │ bytes │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSwabDouble() │ swap bytes of double │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSwabFloat() │ swap bytes of float │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSwabLong() │ swap bytes of long │
└───────────────────────────────────────┴──────────────────────────────────┘
│TIFFSwabLong8() │ swap bytes of long long │
│ │ (uint64_t) │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFSwabShort() │ swap bytes of short │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFTileRowSize() │ return size of a row in a tile │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFTileRowSize64() │ return size of a row in a tile │
│ │ as uint64_t │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFTileSize() │ return size of a tile │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFTileSize64() │ return size of a tile as │
│ │ uint64_t │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFUnlinkDirectory() │ unlink the specified directory │
│ │ from the directory chain │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFUnRegisterCODEC() │ unregisters the codec │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFUnsetField() │ clear the contents of the field │
│ │ in the internal structure │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFVGetField() │ return tag value in current │
│ │ directory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFVGetFieldDefaulted() │ return tag value in current │
│ │ directory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFVSetField() │ set a tag's value in the current │
│ │ directory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFVStripSize() │ return number of bytes in a │
│ │ strip │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFVStripSize64() │ return number of bytes in a │
│ │ strip with nrows rows of data as │
│ │ uint64_t │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFVTileSize() │ returns the number of bytes in a │
│ │ row-aligned tile with nrows of │
│ │ data │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFVTileSize64() │ returns the number of bytes in a │
│ │ row-aligned tile with nrows of │
│ │ data a uint64_t number │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFWarning() │ library-wide warning handling │
│ │ function printing to stderr │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFWarningExt() │ user-specific library-wide │
│ │ warning handling function that │
│ │ can be passed a file handle, │
│ │ which is set to the open TIFF │
│ │ file within libtiff │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFWarningExtR() │ user-specific re-entrant library │
│ │ warning handling function, to │
│ │ which its TIFF structure is │
│ │ passed containing the pointer to │
│ │ a user-specific data object │
└───────────────────────────────────────┴──────────────────────────────────┘
│TIFFWriteBufferSetup() │ sets up the data buffer used to │
│ │ write raw (encoded) data to a │
│ │ file │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFWriteCheck() │ verify file is writable and that │
│ │ the directory information is │
│ │ setup properly │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFWriteCustomDirectory() │ write the current custom │
│ │ directory (also EXIF or GPS) to │
│ │ file │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFWriteDirectory() │ write the current directory │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFWriteEncodedStrip() │ compress and write a strip of │
│ │ data │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFWriteEncodedTile() │ compress and write a tile of │
│ │ data │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFWriteRawStrip() │ write a raw strip of data │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFWriteRawTile() │ write a raw tile of data │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFWriteScanline() │ write a scanline of data │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFWriteTile() │ compress and write a tile of │
│ │ data │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFXYZToRGB() │ perform CIE XYZ to RGB │
│ │ conversion │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFYCbCrtoRGB() │ perform YCbCr to RGB conversion │
├───────────────────────────────────────┼──────────────────────────────────┤
│TIFFYCbCrToRGBInit() │ initialize YCbCr to RGB │
│ │ conversion state │
└───────────────────────────────────────┴──────────────────────────────────┘
LIBTIFF AUXILLARY FUNCTIONS
┌───────────────────────────┬──────────────────────────────────┐
│Name │ Description │
├───────────────────────────┼──────────────────────────────────┤
│_TIFFCheckMalloc() │ checking for integer overflow │
│ │ before dynamically allocate │
│ │ memory buffer │
├───────────────────────────┼──────────────────────────────────┤
│_TIFFCheckRealloc() │ checking for integer overflow │
│ │ before dynamically reallocate │
│ │ memory buffer │
├───────────────────────────┼──────────────────────────────────┤
│_TIFFClampDoubleToUInt32() │ clamps double values into the │
│ │ range of uint32_t (i.e. 0 .. │
│ │ 0xFFFFFFFF) │
├───────────────────────────┼──────────────────────────────────┤
│_TIFFfree() │ free memory buffer │
├───────────────────────────┼──────────────────────────────────┤
│_TIFFGetExifFields() │ return a pointer to the libtiff │
│ │ internal definition list of the │
│ │ EXIF tags │
├───────────────────────────┼──────────────────────────────────┤
│_TIFFGetGpsFields() │ return a pointer to the libtiff │
│ │ internal definition list of the │
│ │ GPS tags │
└───────────────────────────┴──────────────────────────────────┘
│_TIFFmalloc() │ dynamically allocate memory │
│ │ buffer │
├───────────────────────────┼──────────────────────────────────┤
│_TIFFmemcmp() │ compare contents of the memory │
│ │ buffers │
├───────────────────────────┼──────────────────────────────────┤
│_TIFFmemcpy() │ copy contents of the one buffer │
│ │ to another │
├───────────────────────────┼──────────────────────────────────┤
│_TIFFmemset() │ fill memory buffer with a │
│ │ constant byte │
├───────────────────────────┼──────────────────────────────────┤
│_TIFFMultiply32() │ checks for an integer overflow │
│ │ of the multiplication result of │
│ │ uint32_t and return the │
│ │ multiplication result or 0 if an │
│ │ overflow would happen │
├───────────────────────────┼──────────────────────────────────┤
│_TIFFMultiply64() │ checks for an integer overflow │
│ │ of the multiplication result of │
│ │ uint64_t and return the │
│ │ multiplication result or 0 if an │
│ │ overflow would happen │
├───────────────────────────┼──────────────────────────────────┤
│_TIFFrealloc() │ dynamically reallocate memory │
│ │ buffer │
├───────────────────────────┼──────────────────────────────────┤
│_TIFFRewriteField() │ Rewrite a field in the directory │
│ │ on disk without regard to │
│ │ updating the TIFF directory │
│ │ structure in memory │
└───────────────────────────┴──────────────────────────────────┘
TAG USAGE
The table below lists the TIFF tags that are recognized and handled by the library. If no
use is indicated in the table, then the library reads and writes the tag, but does not use
it internally. Note that some tags are meaningful only when a particular compression
scheme is being used; e.g. Group3Options is only useful if Compression is set to CCITT
Group 3 encoding. Tags of this sort are considered codec-specific tags and the library
does not recognize them except when the Compression tag has been previously set to the
relevant compression scheme.
LIBTIFF SUPPORTED TAGS
┌──────────────────────────┬───────┬─────┬─────────────────────┐
│Tag name │ Value │ R/W │ Library Use/Notes │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│Artist │ 315 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│BadFaxLines │ 326 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│BitsPerSample │ 258 │ R/W │ lots │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│CellLength │ 265 │ │ parsed but ignored │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│CellWidth │ 264 │ │ parsed but ignored │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│CleanFaxData │ 327 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│ColorMap │ 320 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│ColorResponseUnit │ 300 │ │ parsed but ignored │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│Compression │ 259 │ R/W │ choosing codec │
└──────────────────────────┴───────┴─────┴─────────────────────┘
│ConsecutiveBadFaxLines │ 328 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│Copyright │ 33432 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│DataType │ 32996 │ R │ obsoleted by │
│ │ │ │ SampleFormat tag │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│DateTime │ 306 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│DocumentName │ 269 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│DotRange │ 336 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│ExtraSamples │ 338 │ R/W │ lots │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│FaxRecvParams │ 34908 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│FaxSubAddress │ 34909 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│FaxRecvTime │ 34910 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│FillOrder │ 266 │ R/W │ control bit order │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│FreeByteCounts │ 289 │ │ parsed but ignored │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│FreeOffsets │ 288 │ │ parsed but ignored │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│GrayResponseCurve │ 291 │ │ parsed but ignored │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│GrayResponseUnit │ 290 │ │ parsed but ignored │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│Group3Options │ 292 │ R/W │ used by Group 3 │
│ │ │ │ codec │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│Group4Options │ 293 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│HostComputer │ 316 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│ImageDepth │ 32997 │ R/W │ tile/strip │
│ │ │ │ calculations │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│ImageDescription │ 270 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│ImageLength │ 257 │ R/W │ lots │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│ImageWidth │ 256 │ R/W │ lots │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│InkNames │ 333 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│InkSet │ 332 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│JPEGTables │ 347 │ R/W │ used by JPEG codec │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│Make │ 271 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│Matteing │ 32995 │ R │ obsoleted by │
│ │ │ │ ExtraSamples tag │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│MaxSampleValue │ 281 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│MinSampleValue │ 280 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│Model │ 272 │ R/W │ │
└──────────────────────────┴───────┴─────┴─────────────────────┘
│NewSubFileType │ 254 │ R/W │ called SubFileType │
│ │ │ │ in spec │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│NumberOfInks │ 334 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│Orientation │ 274 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│PageName │ 285 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│PageNumber │ 297 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│PhotometricInterpretation │ 262 │ R/W │ used by Group 3 and │
│ │ │ │ JPEG codecs │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│PlanarConfiguration │ 284 │ R/W │ data i/o │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│Predictor │ 317 │ R/W │ used by LZW and │
│ │ │ │ Deflate codecs │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│PrimaryChromacities │ 319 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│ReferenceBlackWhite │ 532 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│ResolutionUnit │ 296 │ R/W │ used by Group 3 │
│ │ │ │ codec │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│RowsPerStrip │ 278 │ R/W │ data i/o │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│SampleFormat │ 339 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│SamplesPerPixel │ 277 │ R/W │ lots │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│SMinSampleValue │ 340 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│SMaxSampleValue │ 341 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│Software │ 305 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│StoNits │ 37439 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│StripByteCounts │ 279 │ R/W │ data i/o │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│StripOffsets │ 273 │ R/W │ data i/o │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│SubFileType │ 255 │ R/W │ called OSubFileType │
│ │ │ │ in spec │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│TargetPrinter │ 337 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│Thresholding │ 263 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│TileByteCounts │ 324 │ R/W │ data i/o │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│TileDepth │ 32998 │ R/W │ tile/strip │
│ │ │ │ calculations │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│TileLength │ 323 │ R/W │ data i/o │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│TileOffsets │ 324 │ R/W │ data i/o │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│TileWidth │ 322 │ R/W │ data i/o │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│TransferFunction │ 301 │ R/W │ │
└──────────────────────────┴───────┴─────┴─────────────────────┘
│WhitePoint │ 318 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│XPosition │ 286 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│XResolution │ 282 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│YCbCrCoefficients │ 529 │ R/W │ used by │
│ │ │ │ TIFFRGBAImage │
│ │ │ │ support │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│YCbCrPositioning │ 531 │ R/W │ tile/strip size │
│ │ │ │ calculations │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│YCbCrSubsampling │ 530 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│YPosition │ 286 │ R/W │ │
├──────────────────────────┼───────┼─────┼─────────────────────┤
│YResolution │ 283 │ R/W │ used by Group 3 │
│ │ │ │ codec │
└──────────────────────────┴───────┴─────┴─────────────────────┘
PSEUDO TAGS
In addition to the normal TIFF tags the library supports a collection of tags whose values
lie in a range outside the valid range of TIFF tags. These tags are termed pseudo-tags and
are used to control various codec-specific functions within the library. The table below
summarizes the defined pseudo-tags.
LIBTIFF SUPPORTED TAGS
┌────────────────────────┬──────────┬─────┬─────────────────────┐
│Tag name │ Codec │ R/W │ Library Use/Notes │
├────────────────────────┼──────────┼─────┼─────────────────────┤
│TIFFTAG_FAXMODE │ G3 │ R/W │ general codec │
│ │ │ │ operation │
├────────────────────────┼──────────┼─────┼─────────────────────┤
│TIFFTAG_FAXFILLFUNC │ G3/G4 │ R/W │ bitmap fill │
│ │ │ │ function │
├────────────────────────┼──────────┼─────┼─────────────────────┤
│TIFFTAG_JPEGQUALITY │ JPEG │ R/W │ compression quality │
│ │ │ │ control │
├────────────────────────┼──────────┼─────┼─────────────────────┤
│TIFFTAG_JPEGCOLORMODE │ JPEG │ R/W │ control colorspace │
│ │ │ │ conversions │
├────────────────────────┼──────────┼─────┼─────────────────────┤
│TIFFTAG_JPEGTABLESMODE │ JPEG │ R/W │ control contents of │
│ │ │ │ JPEGTables tag │
├────────────────────────┼──────────┼─────┼─────────────────────┤
│TIFFTAG_ZIPQUALITY │ Deflate │ R/W │ compression quality │
│ │ │ │ level │
├────────────────────────┼──────────┼─────┼─────────────────────┤
│TIFFTAG_PIXARLOGDATAFMT │ PixarLog │ R/W │ user data format │
├────────────────────────┼──────────┼─────┼─────────────────────┤
│TIFFTAG_PIXARLOGQUALITY │ PixarLog │ R/W │ compression quality │
│ │ │ │ level │
├────────────────────────┼──────────┼─────┼─────────────────────┤
│TIFFTAG_SGILOGDATAFMT │ SGILog │ R/W │ user data format │
└────────────────────────┴──────────┴─────┴─────────────────────┘
TIFFTAG_FAXMODE:
Control the operation of the Group 3 codec. Possible values (independent bits that can
be combined by or'ing them together) are:
FAXMODE_CLASSIC:
(enable old-style format in which the RTC is written at the end of the last strip),
FAXMODE_NORTC:
(opposite of FAXMODE_CLASSIC; also called FAXMODE_CLASSF),
FAXMODE_NOEOL:
(do not write EOL codes at the start of each row of data),
FAXMODE_BYTEALIGN:
(align each encoded row to an 8-bit boundary),
FAXMODE_WORDALIGN:
(align each encoded row to an 16-bit boundary),
The default value is dependent on the compression scheme; this pseudo-tag is used by
the various G3 and G4 codecs to share code.
TIFFTAG_FAXFILLFUNC:
Control the function used to convert arrays of black and white runs to packed bit
arrays. This hook can be used to image decoded scanlines in multi-bit depth rasters
(e.g. for display in colormap mode) or for other purposes. The default value is a
pointer to a builtin function that images packed bilevel data.
TIFFTAG_IPTCNEWSPHOTO:
Tag contains image metadata per the IPTC newsphoto spec: Headline, captioning, credit,
etc... Used by most wire services.
TIFFTAG_PHOTOSHOP:
Tag contains Photoshop captioning information and metadata. Photoshop uses in parallel
and redundantly alongside IPTCNEWSPHOTO information.
TIFFTAG_JPEGQUALITY:
Control the compression quality level used in the baseline algorithm. Note that
quality levels are in the range 0-100 with a default value of 75.
TIFFTAG_JPEGCOLORMODE:
Control whether or not conversion is done between RGB and YCbCr colorspaces. Possible
values are:
JPEGCOLORMODE_RAW:
(do not convert), and
JPEGCOLORMODE_RGB:
(convert to/from RGB)
The default value is JPEGCOLORMODE_RAW.
TIFFTAG_JPEGTABLESMODE:
Control the information written in the JPEGTables tag. Possible values (independent
bits that can be combined by or'ing them together) are:
JPEGTABLESMODE_QUANT:
(include quantization tables), and
JPEGTABLESMODE_HUFF:
(include Huffman encoding tables).
The default value is JPEGTABLESMODE_QUANT | JPEGTABLESMODE_HUFF.
TIFFTAG_ZIPQUALITY:
Control the compression technique used by the Deflate codec. Quality levels are in the
range 1-9 with larger numbers yielding better compression at the cost of more
computation. The default quality level is 6 which yields a good time-space tradeoff.
TIFFTAG_PIXARLOGDATAFMT:
Control the format of user data passed in to the PixarLog codec when encoding and
passed out from when decoding. Possible values are:
PIXARLOGDATAFMT_8BIT:
for 8-bit unsigned pixels,
PIXARLOGDATAFMT_8BITABGR:
for 8-bit unsigned ABGR-ordered pixels,
PIXARLOGDATAFMT_11BITLOG:
for 11-bit log-encoded raw data,
PIXARLOGDATAFMT_12BITPICIO:
for 12-bit PICIO-compatible data,
PIXARLOGDATAFMT_16BIT:
for 16-bit signed samples, and
PIXARLOGDATAFMT_FLOAT:
for 32-bit IEEE floating point samples.
TIFFTAG_PIXARLOGQUALITY:
Control the compression technique used by the PixarLog codec. This value is treated
identically to TIFFTAG_ZIPQUALITY; see the above description.
TIFFTAG_SGILOGDATAFMT:
Control the format of client data passed in to the SGILog codec when encoding and
passed out from when decoding. Possible values are:
SGILOGDATAFMT_FLTXYZ:
for converting between LogLuv and 32-bit IEEE floating valued XYZ pixels,
SGILOGDATAFMT_16BITLUV:
for 16-bit encoded Luv pixels,
SGILOGDATAFMT_32BITRAW: SGILOGDATAFMT_24BITRAW:
for no conversion of data,
SGILOGDATAFMT_8BITRGB:
for returning 8-bit RGB data (valid only when decoding LogLuv-encoded data),
SGILOGDATAFMT_FLTY:
for converting between LogL and 32-bit IEEE floating valued Y pixels,
SGILOGDATAFMT_16BITL:
for 16-bit encoded L pixels, and
SGILOGDATAFMT_8BITGRY:
for returning 8-bit greyscale data (valid only when decoding LogL-encoded data).
DIAGNOSTICS
All error messages are directed through the TIFFErrorExtR() routine. By default messages
are directed to stderr in the form: module: message\n. Warning messages are likewise
directed through the TIFFWarningExtR() routine.
SEE ALSO
fax2tiff, pal2rgb, ppm2tiff, rgb2ycbcr, raw2tiff, tiff2bw, tiffdither, tiffdump, tiffcp,
tiff2cmp, tiffgt, tiffinfo, tiffmedian, tiffsplit,
"Tag Image File Format Specification *Revision 6.0*", an Aldus Technical Memorandum.
"The Spirit of TIFF Class F" , an appendix to the TIFF 5.0 specification prepared by
Cygnet Technologies.
BUGS
• The library does not support multi-sample images where some samples have different
bits/sample.
• The library does not support random access to compressed data that is organized with
more than one row per tile or strip.
AUTHOR
LibTIFF contributors
COPYRIGHT
1988-2023, LibTIFF contributors