#include <stdio.h>
int main(){FILE * out = fopen ("pic.data", "wb");
  void ps(short x) {fputc(x>>8, out); fputc(x, out);}
  void putcol(char r, char g, char b){
     fputc(r, out); fputc(g, out); fputc(b, out);}
  ps(256); ps(256);
 {int j=256; while(j--) {int k=256; while(k--) fputc(j+k, out);}}
fclose(out);}