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 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 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, -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 approxi-
	      mately 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)