// similarity = e.g. 0.99f
static Rect rgbFindMostSimilarClip(RGBImage big, RGBImage pat, L<Rect> clips, float similarity) {
  Rect found = null;
  int w = big.getWidth(), h = big.getHeight();
  for (Rect r : clips) {
    float sim = rgbImageSimilarityResized(big.clip(r), pat, similarity);
    if (sim >= similarity) {
      found = r;
      similarity = sim;
    }
  }
  ret found;
}

Began life as a copy of #1006802