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rgb2ycbcr(1)			 User Commands			  rgb2ycbcr(1)

NAME
       rgb2ycbcr - convert non-YCbCr TIFF images to YCbCr TIFF images

SYNOPSIS
       rgb2ycbcr [options] src1.tif [src2.tif...] dest.tif

DESCRIPTION
       rgb2ycbcr  converts  RGB	 color,	 grayscale, 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, and output data files are compressed with the LZW
       compression scheme, with each strip no more  than  8  kilobytes.	 These
       characteristics	can  be	 overridden  or	 explicitly specified with the
       options described below.

OPTIONS
       The following options are supported:

       -c	       Specify a compression scheme to use when writing	 image
		       data:

		       -c jpeg		       Baseline JPEG compression algo‐
					       rithm.

		       -c lzw		       Lempel-Ziv and Welch algorithm.
					       This is the default algorithm.

		       -c none		       No compression.

		       -c packbits	       PackBits compression algorithm.

       -h	       Set  the	 horizontal  sampling  dimension to one of the
		       following: 1, 2, or 4. The default value is 2.

       -r	       Write data with a specified number of rows  per	strip.
		       By default, the number of rows per strip is selected so
		       that each strip is approximately 8 kilobytes.

       -v	       Set the vertical sampling dimension to one of the  fol‐
		       lowing: 1, 2, or 4. The default value is 2.

OPERANDS
       The following operands are supported:

       src.tif	       The name of the input file that contains non-YCbCr TIFF
		       data.

       dest.tif	       The name of the output file that	 contains  YCbCr  TIFF
		       data.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Availability		     │image/library/libtiff	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface stability	     │Uncommitted		   │
       └─────────────────────────────┴─────────────────────────────┘

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

NOTES
       Updated by Breda McColgan, Sun Microsystems Inc., 2004.

SunOS 5.11			  26 Mar 2004			  rgb2ycbcr(1)

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