i, j, x1, y1, x2, y2 = string.find(result, "(%d+),%s*(%d+),%s*(%d+),%s*(%d+)")

-- copy part of image

w, h = x2-x1, y2-y1
pixels = {}

for y = 0, h-1 do
  for x = 0, w-1 do
    pixels[y*w+x+1] = img.getInt(x1+x, y1+y)
  end
end