rgb2ycbcr



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  compres-
              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.


SEE ALSO

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



                               October 15, 1995                   RGB2YCBCR(1)

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