src/main/java/org/apache/xmlgraphics/image/codec/png/PNGImageDecoder.java [275:315]:
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    private int[] gammaLut;

    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;
        }
    }

    private final byte[][] expandBits = {
        null,
        { (byte)0x00, (byte)0xff },
        { (byte)0x00, (byte)0x55, (byte)0xaa, (byte)0xff },
        null,
        { (byte)0x00, (byte)0x11, (byte)0x22, (byte)0x33,
          (byte)0x44, (byte)0x55, (byte)0x66, (byte)0x77,
          (byte)0x88, (byte)0x99, (byte)0xaa, (byte)0xbb,
          (byte)0xcc, (byte)0xdd, (byte)0xee, (byte)0xff }
    };

    private int[] grayLut;

    private void initGrayLut(int bits) {
        int len = 1 << bits;
        grayLut = new int[len];

        if (performGammaCorrection) {
            System.arraycopy(gammaLut, 0, grayLut, 0, len);
        } else {
            for (int i = 0; i < len; i++) {
                grayLut[i] = expandBits[bits][i];
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src/main/java/org/apache/xmlgraphics/image/codec/png/PNGRed.java [311:351]:
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    private int[] gammaLut;

    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;
        }
    }

    private final byte[][] expandBits = {
        null,
        { (byte)0x00, (byte)0xff },
        { (byte)0x00, (byte)0x55, (byte)0xaa, (byte)0xff },
        null,
        { (byte)0x00, (byte)0x11, (byte)0x22, (byte)0x33,
          (byte)0x44, (byte)0x55, (byte)0x66, (byte)0x77,
          (byte)0x88, (byte)0x99, (byte)0xaa, (byte)0xbb,
          (byte)0xcc, (byte)0xdd, (byte)0xee, (byte)0xff }
    };

    private int[] grayLut;

    private void initGrayLut(int bits) {
        int len = 1 << bits;
        grayLut = new int[len];

        if (performGammaCorrection) {
            System.arraycopy(gammaLut, 0, grayLut, 0, len);
        } else {
            for (int i = 0; i < len; i++) {
                grayLut[i] = expandBits[bits][i];
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