<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("#348") 
w, h = img.width, img.height

tbl = {}
for y = 0, h-1 do
  sum = 0
  for x = 0, w-1 do
    sum = sum+bright(rgb(img.getInt(x, y)))
  end
  sum = sum/w
  print("y", y, "heat", sum)
  table.insert(tbl, string.char(string.byte("A")+math.floor(sum*25+0.5)))
end

return "Heat map (vertical): "..table.concat(tbl)