#include <stdio.h>
#include <stdlib.h>
#include <gd.h>

int main(int argc, char** argv){
  FILE *in;
  gdImagePtr im;
  int c;

  in = fopen("S4020198.JPG", "rb");
  im = gdImageCreateFromJpeg(in);
  fclose(in);

  c = gdImageGetPixel(im, gdImageSX(im) / 2, gdImageSY(im) / 2);
  printf("The value of the center pixel is %d; RGB values are %d,%d,%d\n",c, im->red[c], im->green[c], im->blue[c]);
  gdImageDestroy(im);
  return 0;
}