/* inverse.c */
#include <stdio.h>
#include <stdlib.h>
#include "mypgm.h"

void make_inverse_image( )
     /* inverse of image1 is output into image2 */
{
  int x, y;    /* control variable */
  
  printf("Image gray level inversion is performed\n\n");
  x_size2 = x_size1;  /* Width */
  y_size2 = y_size1;  /* Height */
  for (y = 0; y < y_size2; y++) {
    for (x = 0; x < x_size2; x++) {
      image2[y][x] = (unsigned char)
	(MAX_BRIGHTNESS - image1[y][x]);
    }
  }
}


main( )
{
  load_image_data( );    /* Input of image1 */
  make_inverse_image( ); /* Inversion operation */
  save_image_data( );    /* Output of image2 */
  return 0;
}