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/* ppmtorgb3.c - separate a portable pixmap into three portable graymaps
**
** Copyright (C) 1991 by Jef Poskanzer.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
*/
#include <string.h>
#include "ppm.h"
#include "pgm.h"
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp;
FILE* redfile;
FILE* grnfile;
FILE* blufile;
const char* basename;
char filename[100];
char* cp;
pixel* pixelrow;
register pixel* pP;
gray* grayrow;
register gray* gP;
int rows, cols, format, row;
register int col;
pixval maxval;
ppm_init( &argc, argv );
if ( argc > 2 )
pm_usage( "[ppmfile]" );
if ( argc == 2 )
{
ifp = pm_openr( argv[1] );
basename = argv[1];
cp = strrchr( basename, '.' );
if ( cp != NULL )
*cp = '\0';
}
else
{
ifp = stdin;
basename = "noname";
}
ppm_readppminit( ifp, &cols, &rows, &maxval, &format );
pixelrow = ppm_allocrow( cols );
(void) strcpy( filename, basename );
(void) strcat( filename, ".red" );
redfile = pm_openw( filename );
pgm_writepgminit( redfile, cols, rows, (gray) maxval, 0 );
(void) strcpy( filename, basename );
(void) strcat( filename, ".grn" );
grnfile = pm_openw( filename );
pgm_writepgminit( grnfile, cols, rows, (gray) maxval, 0 );
(void) strcpy( filename, basename );
(void) strcat( filename, ".blu" );
blufile = pm_openw( filename );
pgm_writepgminit( blufile, cols, rows, (gray) maxval, 0 );
grayrow = pgm_allocrow( cols );
for ( row = 0; row < rows; ++row )
{
ppm_readppmrow( ifp, pixelrow, cols, maxval, format );
for ( col = 0, pP = pixelrow, gP = grayrow; col < cols;
++col, ++pP, ++gP )
*gP = (gray) PPM_GETR( *pP );
pgm_writepgmrow( redfile, grayrow, cols, maxval, 0 );
for ( col = 0, pP = pixelrow, gP = grayrow; col < cols;
++col, ++pP, ++gP )
*gP = (gray) PPM_GETG( *pP );
pgm_writepgmrow( grnfile, grayrow, cols, maxval, 0 );
for ( col = 0, pP = pixelrow, gP = grayrow; col < cols;
++col, ++pP, ++gP )
*gP = (gray) PPM_GETB( *pP );
pgm_writepgmrow( blufile, grayrow, cols, maxval, 0 );
}
pm_close( ifp );
pm_close( redfile );
pm_close( blufile );
pm_close( grnfile );
exit( 0 );
}
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