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 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)
