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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)