<br />
<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_452p8q0sj6l01325j3tr7763iu, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
<br />
<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
static Rect rectOfDifferentPixels(RGBImage img1, RGBImage img2) {
  rgbImageAssertSameSize(img1, img2);
  Rect r = null;
  int w = img1.getWidth(), 
  for y to h: for x to w: {
    if (img1.getInt(x, y) != img2.getInt(x, y))
      if (r == null)
        r = singlePointRect(x, y);
      else
        extendRectToIncludePoint_modifyOriginal(r, x, y);
  }
  ret r;
}