<br />
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<br />
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get("#348") -- rgb functions

w, h = img.width, img.height
g = 4 -- grid size

r = {}
for gy = 0, h-g, g do
  for gx = 0, w-g, g do
    local min, max = 1, 0
    for y = gy, gy+g-1 do
      for x = gx, gx+g-1 do
        local b = bright(rgb(img.getInt(x, y)))
        min, max = math.min(min, b), math.max(max, b)
      end
    end
    if min < 0.5 and max > 0.5 then
      table.insert(r, gx..", "..gy..", "..gx+g..", "..gy+g)
    end
  end
end

return "Grid: "..table.concat(r, "|")