src/tiff/man/rgb2ycbcr.1

.\"	$Header: /cvs/maptools/cvsroot/libtiff/man/rgb2ycbcr.1,v 1.3 2005/11/02 11:07:19 dron Exp $
.\"
.\" 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
.\" all copies of the software and related documentation, and (ii) the names of
.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
.\" publicity relating to the software without the specific, prior written
.\" permission of Sam Leffler and Silicon Graphics.
.\"
.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
.\"
.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
.\" OF THIS SOFTWARE.
.\"
.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
Commit	Line	Data
	1	.\" $Header: /cvs/maptools/cvsroot/libtiff/man/rgb2ycbcr.1,v 1.3 2005/11/02 11:07:19 dron Exp $
	2	.\"
	3	.\" Copyright (c) 1991-1997 Sam Leffler
	4	.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
	5	.\"
	6	.\" Permission to use, copy, modify, distribute, and sell this software and
	7	.\" its documentation for any purpose is hereby granted without fee, provided
	8	.\" that (i) the above copyright notices and this permission notice appear in
	9	.\" all copies of the software and related documentation, and (ii) the names of
	10	.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
	11	.\" publicity relating to the software without the specific, prior written
	12	.\" permission of Sam Leffler and Silicon Graphics.
	13	.\"
	14	.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
	15	.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
	16	.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
	17	.\"
	18	.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
	19	.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
	20	.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
	21	.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
	22	.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	23	.\" OF THIS SOFTWARE.
	24	.\"
	25	.if n .po 0
	26	.TH RGB2YCBCR 1 "November 2, 2005" "libtiff"
	27	.SH NAME
	28	rgb2ycbcr \- convert non-YCbCr
	29	.SM TIFF
	30	images to a YCbCr
	31	.SM TIFF
	32	image
	33	.SH SYNOPSIS
	34	.B rgb2ycbcr
	35	[
	36	.I options
	37	]
	38	.I "src1.tif src2.tif ... dst.tif"
	39	.SH DESCRIPTION
	40	.I rgb2ycbcr
	41	converts
	42	.SM RGB
	43	color, greyscale, or bi-level
	44	.SM TIFF
	45	images to YCbCr images by transforming and sampling pixel data. If multiple
	46	files are specified on the command line each source file is converted to a
	47	separate directory in the destination file.
	48	.PP
	49	By default, chrominance samples are created by sampling
	50	2 by 2 blocks of luminance values; this can be changed with the
	51	.B \-h
	52	and
	53	.B \-v
	54	options.
	55	Output data are compressed with the
	56	.SM PackBits
	57	compression scheme, by default; an alternate scheme can be selected with the
	58	.B \-c
	59	option.
	60	By default, output data are compressed in strips with
	61	the number of rows in each strip selected so that the
	62	size of a strip is never more than 8 kilobytes;
	63	the
	64	.B \-r
	65	option can be used to explicitly set the number of
	66	rows per strip.
	67	.SH OPTIONS
	68	.TP
	69	.B \-c
	70	Specify a compression scheme to use when writing image data:
	71	.B "\-c none"
	72	for no compression,
	73	.B "-c packbits"
	74	for the PackBits compression algorithm (the default),
	75	.B "-c jpeg"
	76	for the JPEG compression algorithm,
	77	.B "-c zip"
	78	for the deflate compression algorithm,
	79	and
	80	.B "\-c lzw"
	81	for Lempel-Ziv & Welch.
	82	.TP
	83	.B \-h
	84	Set the horizontal sampling dimension to one of: 1, 2 (default), or 4.
	85	.TP
	86	.B \-r
	87	Write data with a specified number of rows per strip;
	88	by default the number of rows/strip is selected so that each strip
	89	is approximately 8 kilobytes.
	90	.TP
	91	.B \-v
	92	Set the vertical sampling dimension to one of: 1, 2 (default), or 4.
	93	.SH "SEE ALSO"
	94	.BR tiffinfo (1),
	95	.BR tiffcp (1),
	96	.BR libtiff (3)
	97	.PP
	98	Libtiff library home page:
	99	.BR http://www.remotesensing.org/libtiff