static L<BufferedImage> bufferedImageHorizontalSlices(double sliceWidth, BufferedImage img) {
  new L<BufferedImage> out;
  int w = img.getWidth(), h = img.getHeight();
  for (double x = 0; iround(x) < w; x += sliceWidth) {
    int actualX = iround(x), nextX = min(w, iround(x+sliceWidth));
    if (nextX > actualX)
      out.add(clipBufferedImage(img, rectFromPoints(actualX, 0, nextX, h)));
  }
  ret out;
}

Began life as a copy of #1024668