RGB2YCBCR(1)                                         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  LZW  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, -c jpeg for
              the JPEG compression algorithm, and -c lzw for Lem-
              pel-Ziv & Welch (the default).

       -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)

                         October 15, 1995                       1