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.\"	$Header: /cvs/maptools/cvsroot/libtiff/man/rgb2ycbcr.1,v 1.4 2006-04-20 12:17:19 dron Exp $
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.\" Copyright (c) 1991-1997 Sam Leffler
.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
.\"
.\" Permission to use, copy, modify, distribute, and sell this software and 
.\" its documentation for any purpose is hereby granted without fee, provided
.\" that (i) the above copyright notices and this permission notice appear in
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.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
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.if n .po 0
.TH RGB2YCBCR 1 "November 2, 2005" "libtiff"
.SH NAME
rgb2ycbcr \- convert non-YCbCr
.SM TIFF
images to a YCbCr
.SM TIFF
image
.SH SYNOPSIS
.B rgb2ycbcr
[
.I options
]
.I "src1.tif src2.tif ... dst.tif"
.SH DESCRIPTION
.I rgb2ycbcr
converts
.SM RGB
color, greyscale, or bi-level
.SM 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.
.PP
By default, chrominance samples are created by sampling
2 by 2 blocks of luminance values; this can be changed with the
.B \-h
and
.B \-v
options.
Output data are compressed with the
.SM PackBits
compression scheme, by default; an alternate scheme can be selected with the
.B \-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
.B \-r
option can be used to explicitly set the number of
rows per strip.
.SH OPTIONS
.TP
.B \-c
Specify a compression scheme to use when writing image data:
.B "\-c none"
for no compression,
.B "\-c packbits"
for the PackBits compression algorithm (the default),
.B "\-c jpeg"
for the JPEG compression algorithm,
.B "\-c zip"
for the deflate compression algorithm,
and
.B "\-c lzw"
for Lempel-Ziv & Welch.
.TP
.B \-h
Set the horizontal sampling dimension to one of: 1, 2 (default), or 4.
.TP
.B \-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.
.TP
.B \-v
Set the vertical sampling dimension to one of: 1, 2 (default), or 4.
.SH "SEE ALSO"
.BR tiffinfo (1),
.BR tiffcp (1),
.BR libtiff (3)
.PP
Libtiff library home page:
.BR http://www.remotesensing.org/libtiff