91 lines
3.4 KiB
Groff
91 lines
3.4 KiB
Groff
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.\" $Header: /cvs/maptools/cvsroot/libtiff/man/tiff2rgba.1,v 1.1 2001-06-13 15:23:57 warmerda Exp $
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.\"
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.\" Copyright (c) 1988-1997 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 TIFF2RGBA 1 "June 13, 2001"
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.SH NAME
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tiff2rgba \- convert a
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.SM TIFF
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image to RGBA color space
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.SH SYNOPSIS
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.B tiff2rgba
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[
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options
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]
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.I input.tif
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.I output.tif
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.SH DESCRIPTION
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.I Tiff2rgba
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converts a wide variety of TIFF images into an RGBA TIFF image. This
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includes the ability to translate different color spaces and photometric
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interpretation into RGBA, support for alpha blending, and translation
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of many different bit depths into a 32bit RGBA image.
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.P
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Internally this program is implemented using the
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.I TIFFReadRGBAImage()
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function, and it suffers any limitations of that image. This includes
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limited support for > 8 BitsPerSample images, and flaws with some
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esoteric combinations of BitsPerSample, photometric interpretation,
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block organization and planar configuration.
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.P
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The generated images are stripped images with four samples per pixel
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(red, green, blue and alpha) or if the -n flag is used, three samples
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per pixel (red, green, and blue). The resulting images are always planar
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configuration contiguous. For this reason, this program is a useful utility
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for transform exotic TIFF files into a form ingestable by almost any TIFF
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supporting software.
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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 (the default),
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.B "-c packbits"
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for the PackBits compression algorithm,
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.B "-c zip
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for the Deflate 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.
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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 \-b
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Process the image one block (strip/tile) at a time instead of by reading
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the whole image into memory at once. This may be necessary for very large
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images on systems with limited RAM.
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.TP
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.B \-n
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Drop the alpha component from the output file, producing a pure RGB file.
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Currently this does not work if the -b flag is also in effect.
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.SH "SEE ALSO"
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.IR tiff2bw (1),
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.IR TIFFReadRGBAImage (3t),
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.IR libtiff (3)
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