<br />
<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_ldl28inndueh5s9jdf2fptf2lk, 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 />
get("#372") -- getContrast

brightnessThreshold = 0.5

-- convert pixel by pixel

w, h = img.width, img.height
pixels = {}
for y = 0, h-1 do
  for x = 0, w-1 do
    b = bright(rgb(img.getInt(x, y)))
    pixels[y*w+x+1] = b >= brightnessThreshold and -1 or 0
  end
end