!7

static ImageSurface isGood, isBad;

p {
  repeat with sleep 1 {
    Rect r = randomScreenPart(50, 50);
    RGBImage clip = rgbShootScreen(r);
    float prec = rgbLocalPrecision(img, r);
    if (prec >= 0.5f)
      isGood = showImage(isGood, "Precise", clip);
    else
      isBad = showImage(isBad, "Wobbly", clip);
  }
}