static BWImage scaleAndPosterize(BufferedImage img, SnPSettings settings) {
  ret scaleAndPosterize(BWIntegralImage(img), settings);
}

static BWImage scaleAndPosterize(IBWIntegralImage ii, SnPSettings settings) {
  ret posterizeBWImage_withMeta(settings.colors,
    scaledBWImageFromBWIntegralImage_withMeta_height(settings.pixelRowsForImage(ii), ii));
}