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

int main()
{
 /*image initialisieren*/
 gdImagePtr image;
 FILE *png;
 int black, white, red, blue, yelow;
 /*Wir erzeugen ein Image mit 100x100 Pixel*/
 image=gdImageCreate(100,100);

 /*Speicher für die Farben allozieren*/
 white=gdImageColorAllocate(image,0,0,0);   /*Weiss*/
 black=gdImageColorAllocate(image,255,255,255); /*Schwarz*/
 red  =gdImageColorAllocate(image,255,0,0); /*rot*/
 blue =gdImageColorAllocate(image,0,0,255); /*blau*/
 yelow=gdImageColorAllocate(image,255,255,0); /*gelb*/

 gdImageRectangle(image,0,0,99,99,black);
 gdImageRectangle(image,1,1,49,49,yelow);
 gdImageFill(image,25,25,red);
 gdImageRectangle(image,50,1,98,49,yelow);
 gdImageFill(image,75,25, blue);
 gdImageRectangle(image,1,50,49,98,yelow);
 gdImageFill(image, 25,75,blue);
 gdImageRectangle(image,50,50,98,98,yelow);
 gdImageFill(image, 75,75,red);

 png = fopen("bild1.png","wb");

 gdImagePng(image,png);

 fclose(png);

 gdImageDestroy(image);

 return 0;
}