get("#348") -- rgb and bright

w, h = img.width, img.height

sumx, sumy, sumdensity = 0, 0, 0
for y=0, h-1 do
  for x=0, w-1 do
    density = 1-bright(rgb(img.getInt(x,y)))
    sumdensity = sumdensity+density
    sumx = sumx+density*x
    sumy = sumy+density*y
  end
end

sumx, sumy = sumx/sumdensity, sumy/sumdensity
px, py = math.floor(sumx+0.5), math.floor(sumy+0.5)

return "Schwerpunkt: "..px..", "..py