NAME

       TIFFReadRGBAStrip - read and decode an image strip into a fixed-format raster

SYNOPSIS

          #include <tiffio.h>

       int TIFFReadRGBAStrip(TIFF *tif, uint32_t row, uint32_t *raster)

       int TIFFReadRGBAStripExt(TIFF *tif, uint32_t row, uint32_t *raster, int stop_on_error)

DESCRIPTION

       TIFFReadRGBAStrip()  reads  a single strip of a strip-based image into memory, storing the
       result in the user supplied RGBA raster.   The  raster  is  assumed  to  be  an  array  of
       ImageWidth  ×  RowsPerStrip  32-bit  entries,  where  ImageWidth is the width of the image
       (TIFFTAG_IMAGEWIDTH)   and   RowsPerStrip   is   the   maximum   lines    in    a    strip
       (TIFFTAG_ROWSPERSTRIP).

       TIFFReadRGBAStripExt()  provides  the paramater stop_on_error.  Its behaviour is described
       at TIFFReadRGBAImage.

       The row value should be the row of the first row in the strip (strip × RowsPerStrip,  zero
       based).

       Note  that  the raster is assume to be organized such that the pixel at location (x, y) is
       raster [ y × width + x ]; with the raster origin in the  lower-left  hand  corner  of  the
       strip.  That is bottom to top organization.  When reading a partial last strip in the file
       the last line of the image will begin at the beginning of the buffer.

       Raster pixels are 8-bit packed red, green,  blue,  alpha  samples.  The  macros  TIFFGetR,
       TIFFGetG,  TIFFGetB,  and  TIFFGetA  should  be  used to access individual samples. Images
       without Associated Alpha matting information have a constant Alpha of 1.0 (255).

       See the TIFFRGBAImage page for more details on how various image types  are  converted  to
       RGBA values.

NOTES

       Samples  must be either 1, 2, 4, 8, or 16 bits.  Colorimetric samples/pixel must be either
       1, 3, or 4 (i.e. SamplesPerPixel - ExtraSamples).

       Palette image colormaps that  appear  to  be  incorrectly  written  as  8-bit  values  are
       automatically scaled to 16-bits.

       TIFFReadRGBAStrip()  is  just  a wrapper around the more general TIFFRGBAImage facilities.
       It's main advantage over the similar TIFFReadRGBAImage() function is that for large images
       a  single  buffer  capable  of  holding the whole image doesn't need to be allocated, only
       enough for one strip.  The TIFFReadRGBATile() function does a similar operation for  tiled
       images.

RETURN VALUES

       1  is returned if the image was successfully read and converted.  Otherwise, 0 is returned
       if an error was encountered.

DIAGNOSTICS

       All error messages are directed to the TIFFErrorExtR() routine.

       "Sorry, can not handle %d-bit pictures":
          The image had BitsPerSample other than 1, 2, 4, 8, or 16.

       "Sorry, can not handle %d-channel images":
          The image had SamplesPerPixel other than 1, 3, or 4.

       Missing needed "PhotometricInterpretation" tag:
          The image did not have a tag that describes how to display the data.

       No "PhotometricInterpretation" tag, assuming RGB:
          The image was missing a tag that describes how to display it, but because it has 3 or 4
          samples/pixel, it is assumed to be RGB.

       No "PhotometricInterpretation" tag, assuming min-is-black\fP:
          The  image  was  missing  a  tag that describes how to display it, but because it has 1
          sample/pixel, it is assumed to be a grayscale or bilevel image.

       "No space for photometric conversion table":
          There was insufficient memory for a table used to convert image samples to 8-bit RGB.

       Missing required "Colormap" tag:
          A Palette image did not have a required Colormap tag.

       "No space for tile buffer":
          There was insufficient memory to allocate an i/o buffer.

       "No space for strip buffer":
          There was insufficient memory to allocate an i/o buffer.

       "Can not handle format":
          The  image  has  a  format  (combination   of   BitsPerSample,   SamplesPerPixel,   and
          PhotometricInterpretation) that TIFFReadRGBAImage() can not handle.

       "No space for B&W mapping table":
          There was insufficient memory to allocate a table used to map grayscale data to RGB.

       "No space for Palette mapping table":
          There was insufficient memory to allocate a table used to map data to 8-bit RGB.

SEE ALSO

       TIFFOpen  (3tiff),  TIFFRGBAImage  (3tiff),  TIFFReadRGBAImage  (3tiff),  TIFFReadRGBATile
       (3tiff), libtiff (3tiff)

AUTHOR

       LibTIFF contributors

COPYRIGHT

       1988-2024, LibTIFF contributors