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sclass Gazelle22_GradientImage { // input BWImage posterized; // output BWImage out; // internal PosterizeBWImage op; BWImage unposterized; int w, h, brightnessLevels, singleStep; BWImage get() { op = (PosterizeBWImage) getMetaSrc(posterized); unposterized = op.img; brightnessLevels = op.brightnessLevels; assertSameSize(unposterized, posterized); w = posterized.getWidth(); h = posterized.getHeight(); out = new BWImage(w*2+1, h*2+1); singleStep = iceil(doubleRatio(255, brightnessLevels-1)); for y to h: for x to w: { if (x < w-1) checkPair(x, y, x+1, y); if (y < h-1) checkPair(x, y, x, y+1); } ret out; } void checkPair(int x, int y, int x2, int y2) { int posterizedContrast = absDiff(posterized.getInt(x, y), posterized.getInt(x+1, y)); if (posterizedContrast == 0) ret; if (posterizedContrast > singleStep) ret; int realContrast = absDiff(unposterized.getInt(x, y), unposterized.getInt(x+1, y)); double ratio = doubleRatio(realContrast, singleStep); if (ratio < .5) { float result = 1f; out.setPixel(x*2+1-(x2-x), y*2+1, result); out.setPixel(x*2+1, y*2+1-(y2-y), result); } } }