NAME

       tiff2rgba - convert a TIFF image to RGBA color space

SYNOPSIS

       tiff2rgba [ options ] input.tif output.tif

DESCRIPTION

       Tiff2rgba  converts  a wide variety of TIFF images into an RGBA TIFF image.  This includes
       the ability to translate different color spaces and photometric interpretation into  RGBA,
       support for alpha blending, and translation of many different bit depths into a 32bit RGBA
       image.

       Internally this program is implemented using  the  TIFFReadRGBAImage()  function,  and  it
       suffers   any  limitations  of  that  image.   This  includes  limited  support  for  >  8
       BitsPerSample  images,  and  flaws  with  some  esoteric  combinations  of  BitsPerSample,
       photometric interpretation, block organization and planar configuration.

       The generated images are stripped images with four samples per pixel (red, green, blue and
       alpha) or if the -n flag is used, three samples per pixel (red,  green,  and  blue).   The
       resulting  images  are  always  planar  configuration  contiguous.   For this reason, this
       program is a useful utility for transform exotic TIFF files  into  a  form  ingestible  by
       almost any TIFF supporting software.

OPTIONS

       -c     Specify  a  compression  scheme  to  use  when  writing  image data: -c none for no
              compression (the default), -c packbits for the PackBits compression  algorithm,  -c
              zip  for  the  Deflate  compression  algorithm,  -c  jpeg  for the JPEG compression
              algorithm, and -c lzw for Lempel-Ziv & Welch.

       -r     Write data with a specified number of rows per strip;  by  default  the  number  of
              rows/strip is selected so that each strip is approximately 8 kilobytes.

       -b     Process  the image one block (strip/tile) at a time instead of by reading the whole
              image into memory at once.  This may be necessary for very large images on  systems
              with limited RAM.

       -n     Drop  the  alpha  component  from  the  output  file,  producing  a  pure RGB file.
              Currently this does not work if the -b flag is also in effect.

       -M size
              Set maximum memory allocation size (in MiB). The default is 256MiB.  Set  to  0  to
              disable the limit.

SEE ALSO

       tiff2bw(1), TIFFReadRGBAImage(3t), libtiff(3)

       Libtiff library home page: http://www.simplesystems.org/libtiff/