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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.pixelRows, ii));
}