rgb2ycbcr(1)

RGB2YCBCR(1)             USER COMMANDS               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)

                  Last change: October 15, 1995                 1