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RedHat 9 (Linux i386) - man page for rgb2ycbcr (redhat section 1)

RGB2YCBCR(1)			     General Commands Manual			     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 trans-
       forming 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  com-
	      pression,  -c packbits for the PackBits compression 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)


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