# RGB2YCBCR

Section: User Commands (1)
Updated: October 15, 1995
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## 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 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)

## Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
SEE ALSO

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Time: 01:31:47 GMT, November 23, 1999