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/* pgmbentley.c - read a portable graymap and smear it according to brightness
**
** Copyright (C) 1990 by Wilson Bent (whb@hoh-2.att.com)
**
** 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 <stdio.h>
#include "pgm.h"
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp;
gray maxval;
gray** gin;
gray** gout;
int argn, rows, cols, row;
register int brow, col;
const char* const usage = "[pgmfile]";
pgm_init( &argc, argv );
argn = 1;
if ( argn < argc )
{
ifp = pm_openr( argv[argn] );
++argn;
}
else
ifp = stdin;
if ( argn != argc )
pm_usage( usage );
gin = pgm_readpgm( ifp, &cols, &rows, &maxval );
pm_close( ifp );
gout = pgm_allocarray( cols, rows );
#define N 4
for (row = 0; row < rows; ++row)
for (col = 0; col < cols; ++col)
gout[row][col] = 0;
for ( row = 0; row < rows; ++row )
for ( col = 0; col < cols; ++col )
{
brow = row + (int) (gin[row][col]) / N;
if ( brow >= rows )
brow = rows - 1;
gout[brow][col] = gin[row][col];
}
pgm_writepgm( stdout, gout, cols, rows, maxval, 0 );
pm_close( stdout );
pgm_freearray( gout, rows );
exit( 0 );
}
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