static L<BufferedImage> imageToRoughlyFixedSizeTiles(BufferedImage img, int roughSize) {
  ret imageToRoughlyFixedSizeTiles(img, roughSize, roughSize);
}

static L<BufferedImage> imageToRoughlyFixedSizeTiles(BufferedImage img, int roughW, int roughH) {
  int w = img.getWidth(), h = img.getHeight();
  int n = max(1, iround(doubleRatio(w, roughW)));
  int m = max(1, iround(doubleRatio(h, roughH)));
  ret imageToTiles(img, m, n);
}