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rgb2ycbcr(1)


NAME

   rgb2ycbcr - convert non-YCbCr TIFF images to a YCbCr TIFF image

SYNOPSIS

   rgb2ycbcr [ options ] src1.tif src2.tif ... dst.tif

DESCRIPTION

   rgb2ycbcr  converts  RGB  color,  greyscale, or bi-level TIFF images to
   YCbCr images by transforming and sampling pixel data. If multiple files
   are  specified  on  the command line each source file is converted to a
   separate directory in the destination file.

   By default, chrominance samples are created by sampling 2 by  2  blocks
   of  luminance  values;  this can be changed with the -h and -v options.
   Output data are compressed with the  PackBits  compression  scheme,  by
   default;  an  alternate  scheme can be selected with the -c option.  By
   default, output data are compressed in strips with the number  of  rows
   in each strip selected so that the size of a strip is never more than 8
   kilobytes; the -r option can be used to explicitly set  the  number  of
   rows per strip.

OPTIONS

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

   -h     Set the horizontal sampling dimension to one of: 1, 2 (default),
          or 4.

   -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.

   -v     Set the vertical sampling dimension to one of: 1,  2  (default),
          or 4.

SEE ALSO

   tiffinfo(1), tiffcp(1), libtiff(3)

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



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