$Id$

Copyright (c) 1988-1997 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.

tiffsv - save an image from the framebuffer in a TIFF file (Silicon Graphics version) tiffsv [ options ] output.tif [ "x1 x2 y1 y2" ] tiffsv saves all or part of the framebuffer in a file using the Tag Image File Format, Revision 6.0. By default, the image is saved with data samples packed (\c PlanarConfiguration =1), compressed with the Lempel-Ziv & Welch algorithm (\c Compression =5), and with each strip no more than 8 kilobytes. These characteristics can be overridden, or explicitly specified with the options described below.

-b Save the image as a greyscale image as if it were processed by tiff2bw (1). This option is included for compatibility with the standard scrsave (6D) program.

-c Specify the compression to use for data written to the output file: none for no compression, packbits for PackBits compression, jpeg for baseline JPEG compression, zip for Deflate compression, and lzw for Lempel-Ziv & Welch compression (default).

LZW compression can be specified together with a predictor value. A predictor value of 2 causes each scanline of the output image to undergo horizontal differencing before it is encoded; a value of 1 forces each scanline to be encoded without differencing. LZW-specific options are specified by appending a ``:''-separated list to the ``lzw'' option; e.g. "-c lzw:2" for LZW compression with horizontal differencing.

-p Specify the planar configuration to use in writing image data. By default, tiffsv will create a new file with the data samples packed contiguously. Specifying "-p contig" will force data to be written with multi-sample data packed together, while "-p separate" will force samples to be written in separate planes.

-r Specify the number of rows (scanlines) in each strip of data written to the output file. By default, tiffsv attempts to set the rows/strip that no more than 8 kilobytes of data appear in a strip.

Except for the use of TIFF, this program is equivalent to the standard scrsave program. This means, for example, that you can use it in conjunction with the standard icut program simply by creating a link called scrsave , or by creating a shell script called scrsave that invokes tiffgt with the appropriate options. If data are saved compressed and in separate planes, then the rows in each strip is silently set to one to avoid limitations in the libtiff (3TIFF) library. scrsave (6D) pal2rgb (1), tiffdump (1), tiffgt (1), tiffinfo (1), tiffcp (1), tiffmedian (1), libtiff (3TIFF)

Libtiff library home page: http://www.remotesensing.org/libtiff/