99 lines
2.9 KiB
Groff
99 lines
2.9 KiB
Groff
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.\" $Header: /cvs/maptools/cvsroot/libtiff/man/rgb2ycbcr.1,v 1.1 1999-07-27 21:50:28 mike Exp $
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.\"
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.\" Copyright (c) 1991-1997 Sam Leffler
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.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
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.\"
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.\" Permission to use, copy, modify, distribute, and sell this software and
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.\" its documentation for any purpose is hereby granted without fee, provided
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.\" that (i) the above copyright notices and this permission notice appear in
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.\" all copies of the software and related documentation, and (ii) the names of
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.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
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.\" publicity relating to the software without the specific, prior written
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.\" permission of Sam Leffler and Silicon Graphics.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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.\" OF THIS SOFTWARE.
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.\"
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.if n .po 0
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.TH RGB2YCBCR 1 "October 15, 1995"
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.SH NAME
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rgb2ycbcr \- convert non-YCbCr
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.SM TIFF
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images to a YCbCr
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.SM TIFF
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image
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.SH SYNOPSIS
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.B rgb2ycbcr
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[
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.I options
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]
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.I "src1.tif src2.tif ... dst.tif"
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.SH DESCRIPTION
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.I rgb2ycbcr
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converts
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.SM RGB
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color, greyscale, or bi-level
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.SM TIFF
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images to YCbCr images by
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transforming and sampling pixel data.
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If multiple files are specified on the command line
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each source file is converted to a separate directory
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in the destination file.
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.PP
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By default, chrominance samples are created by sampling
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2 by 2 blocks of luminance values; this can be changed with
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the
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.B \-h
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and
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.B \-v
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options.
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Output data are compressed with the
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.SM LZW
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compression scheme, by default; an alternate scheme can be
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selected with the
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.B \-c
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option.
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By default, output data are compressed in strips with
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the number of rows in each strip selected so that the
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size of a strip is never more than 8 kilobytes;
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the
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.B \-r
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option can be used to explicitly set the number of
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rows per strip.
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.SH OPTIONS
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.TP
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.B \-c
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Specify a compression scheme to use when writing image data:
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.B "\-c none"
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for no compression,
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.B "-c packbits"
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for the PackBits compression algorithm,
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.B "-c jpeg"
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for the JPEG compression algorithm,
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and
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.B "\-c lzw"
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for Lempel-Ziv & Welch (the default).
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.TP
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.B \-h
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Set the horizontal sampling dimension to one of: 1, 2 (default), or 4.
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.TP
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.B \-r
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Write data with a specified number of rows per strip;
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by default the number of rows/strip is selected so that each strip
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is approximately 8 kilobytes.
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.TP
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.B \-v
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Set the vertical sampling dimension to one of: 1, 2 (default), or 4.
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.SH "SEE ALSO"
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.IR tiffinfo (1),
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.IR tiffcp (1),
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.IR libtiff (3)
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