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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_5llqcgbsgjm78i6s6k3j6mlhr3, 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 />
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<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 BWImage saturationChannel(BufferedImage img) {
  if (img == null) null;
  int w = img.getWidth(), h = img.getHeight();
  BWImage img2 = new(w, h);
  for y to h: for x to w:
    img2.setPixel(x, y, saturationFromRGB(img.getRGB(x, y)));
  ret img2;
}