tiff2rgba - convert a TIFF image to RGBA color space


   tiff2rgba [ options ] input.tif output.tif


   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.


   -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.


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

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


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