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.remotesensing.org/libtiff

libtiff                                         November 2, 2005                                    RGB2YCBCR(1)