/*Realiza o complemento ou inversao de uma imagem em niveis de cinza  */
 
#define MAX
#include "lib.h"
#include <math.h>

void invert (IMAGE x);

void invert (IMAGE x)
{
	int i,j ;
	 
	for (i= 0; i< x->info->nr-1; i++)
	  for (j= 0; j < x->info->nc-1; j++)
	    x->data[i][j] = 255- x->data[i][j] ; 
}   
 

main (int argc, char *argv[])
{
	IMAGE x=0;

	if (argc < 2)
	{
	  printf ("Usage: complement <image> \n");
	  exit (1);
	}

	x = Input_PBM (argv[1]);
	if (x == 0)
	{
	  printf ("No input image ('%s')\n", argv[1]);
	  exit (2);
	}

	invert (x);

	Output_PBM (x, "invert.pgm");
	printf ("Output is in file 'invert.pgm'\n");
}