rgb2ycbcr man page on FreeBSD

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RGB2YCBCR(1)							  RGB2YCBCR(1)

       rgb2ycbcr - convert non-YCbCr TIFF images to a YCbCr TIFF image

       rgb2ycbcr [ options ] src1.tif src2.tif ... dst.tif

       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.

       -c     Specify  a compression scheme to use when writing image data: -c
	      none for no compression, -c packbits for the  PackBits  compresā€
	      sion  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.

       tiffinfo(1), tiffcp(1), libtiff(3)

       Libtiff library home page: http://www.remotesensing.org/libtiff

libtiff			       November 2, 2005			  RGB2YCBCR(1)

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