src/main/java/org/apache/xmlgraphics/image/codec/png/PNGImageDecoder.java [277:292]:
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    private void initGammaLut(int bits) {
        double exp = (double)userExponent / (fileGamma * displayExponent);
        int numSamples = 1 << bits;
        int maxOutSample = (bits == 16) ? 65535 : 255;

        gammaLut = new int[numSamples];
        for (int i = 0; i < numSamples; i++) {
            double gbright = (double)i / (numSamples - 1);
            double gamma = Math.pow(gbright, exp);
            int igamma = (int)(gamma * maxOutSample + 0.5);
            if (igamma > maxOutSample) {
                igamma = maxOutSample;
            }
            gammaLut[i] = igamma;
        }
    }
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src/main/java/org/apache/xmlgraphics/image/codec/png/PNGRed.java [313:328]:
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    private void initGammaLut(int bits) {
        double exp = (double)userExponent / (fileGamma * displayExponent);
        int numSamples = 1 << bits;
        int maxOutSample = (bits == 16) ? 65535 : 255;

        gammaLut = new int[numSamples];
        for (int i = 0; i < numSamples; i++) {
            double gbright = (double)i / (numSamples - 1);
            double gamma = Math.pow(gbright, exp);
            int igamma = (int)(gamma * maxOutSample + 0.5);
            if (igamma > maxOutSample) {
                igamma = maxOutSample;
            }
            gammaLut[i] = igamma;
        }
    }
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