RGB2YCBCR(1) - phpMan

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 Pack-
       Bits  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 (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)

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