!7

static int size = 33;

p {
  repeat with ms sleep 100 {
    RGBImage orig = rgbShootScreen(rectAround(mousePointer(), size, size));
    RGBImage img = new RGBImage(size, size, Color.gray);
    int radius = size/2-2;
    L<Pt> points = circlePoints(size/2, size/2, radius);
    int n = l(points);
    float[] values = new float[n];
    for i to n:
      values[i] = orig.getPixel(points.get(i)).getBrightness();
    values = cyclicBlur(values);
    L<Int> minima = cyclicLocalMinima(values);
    for (int i : minima)
      rgbMarkPoint(img, points.get(i));
    for (Pt p : points)
      img.setPixel(p, orig.getPixel(p));
    alwaysOnTop(quickShowZoomedImage(img));
  }
}

Began life as a copy of #1006782