libvips/tools/other/spatres.c

84 lines
2.1 KiB
C

/* @(#) Reduces the spatial resolution of an image by increasing the
* @(#) pixel size
* @(#)
* @(#) Usage: spatres in out step
* @(#)
*
* Copyright: 1991, N. Dessipris.
*
* Author: Nicos Dessipris
* Written on: 27/03/1991
* Modified on :
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <stdlib.h>
#include <vips/vips.h>
int
main( int argc, char **argv )
{
IMAGE *in, *out;
int step = 0;
if( im_init_world( argv[0] ) )
error_exit( "unable to start VIPS" );
if ( (argc != 4)||(argv[1][0] == '-') )
error_exit(
"Usage:\n%s in out step\n\n\
WARNING: The program destroys the opfile if the owner has rw access on it.",
argv[0]);
step = atoi(argv[3]);
if ((in= im_open(argv[1],"r")) == NULL)
error_exit("Unable to open %s for input", argv[1]);
if ( (out=im_open(argv[2],"w")) == NULL )
error_exit("Unable to open %s", argv[2]);
if ( im_spatres(in, out, step) == -1)
error_exit("Unable to im_spatres");
if ( im_updatehist(out, argv[0], argc - 1, argv + 1) == -1)
error_exit("Unable to update history");
if ( (im_close(in) == -1)||(im_close(out) == -1) )
error_exit("unable to close %s or %s",argv[1],argv[2]);
return(0);
}