<br />
<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_rg1kllb6m7okh3da5gpfuoro74, 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 />
// scales second image to size of first
// interprets second image as 50% brightness meaning zero
static BufferedImage addBufferedImagesPixelByPixel_minus50(BufferedImage img1, BufferedImage img2, double factor default 1) {
  int w = img1.getWidth(), h = img1.getHeight();
  BufferedImage img = newImage(w, h);
  BufferedImage img2scaled = resizeImage(img2, w, h);
  for y to h:
    for x to w: {
      RGB a = bufferedImage_getRGB(img1, x, y);
      RGB b = bufferedImage_getRGB(img2scaled, x, y);
      setRGB(img, x, y, RGB.newSafe(
        a.r+(b.r-0.5)*factor,
        a.g+(b.g-0.5)*factor,
        a.b+(b.b-0.5)*factor));
    }
  ret img;
}