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static void darkenBWImagePart(BWImage img, Rect r) { int x2 = r.x2(), y2 = r.y2(); float factor = 0.8f; for (int y = r.y; y < y2; y++) for (int x = r.x; x < x2; x++) img.setPixel(x, y, img.getPixel(x, y)*factor); }