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

int main()
{
   /*image initialisieren*/
   gdImagePtr image;
   FILE *png;
   int c;

    png = fopen("./bild1.jpg", "rb");
    if(png==NULL) { /*Fehler*/ exit(0); }
    image = gdImageCreateFromJpeg(png);
    fclose(png);

printf("X: %d, Y: %d\n",image->sx,image->sy);
c=gdImageGetPixel(image,1,1);
printf("px: %d\n",c);

printf("The value of the center pixel is %d; RGB values are %d,%d,%d\n",c, image->red[c], image->green[c], image->blue[c]);
   gdImageDestroy(image);

   return 0;
}