rgb2ycbcr

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 kilo-
       bytes; 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  compres-
              sion  algorithm, -c jpeg for the JPEG compression algorithm, and
              -c lzw for Lempel-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                   RGB2YCBCR(1)