srecord noeq CutOutRegionFromImage(IImageRegion region) {
  settable double alphaNonContained = 0.5;
  
  // optional
  settable BufferedImage fullImage;
  
  // grow bounds by this many pixels to include surroundings
  settable int margin;
  
  // optional
  settable Rect rect;
  
  BufferedImage get() {
    if (region == null) null;
    fullImage if null = toBufferedImage(region.image());
    if (fullImage == null) null;
    rect = region.bounds();
    rect = intersectRects(growRect(rect, margin), imageRect(fullImage));
    var clipped = clipBufferedImage(fullImage, rect);
    int[] pixels = pixelsOfBufferedImage(clipped);
    int w = rect.w, h = rect.h, i = 0;
    for y to h:
      for x to w: {
        if (!region.contains(rect.x+x, rect.y+y))
          pixels[i] = withAlpha(alphaNonContained, pixels[i]);
        ++i;
      }
    ret bufferedImageWithAlpha(w, h, pixels);
  }
}