batik-codec/src/main/java/org/apache/batik/ext/awt/image/codec/png/PNGImageDecoder.java [1183:1219]:
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    private void parse_sRGB_chunk(PNGChunk chunk) {
        sRGBRenderingIntent = chunk.getByte(0);

        // The presence of an sRGB chunk implies particular
        // settings for gamma and chroma.
        fileGamma = 45455/100000.0F;

        chromaticity = new float[8];
        chromaticity[0] = 31270/10000.0F;
        chromaticity[1] = 32900/10000.0F;
        chromaticity[2] = 64000/10000.0F;
        chromaticity[3] = 33000/10000.0F;
        chromaticity[4] = 30000/10000.0F;
        chromaticity[5] = 60000/10000.0F;
        chromaticity[6] = 15000/10000.0F;
        chromaticity[7] =  6000/10000.0F;

        if (performGammaCorrection) {
            // File gamma is 1/2.2
            float gamma = fileGamma*(displayExponent/userExponent);
            if (encodeParam != null) {
                encodeParam.setGamma(gamma);
                encodeParam.setChromaticity(chromaticity);
            }
            if (emitProperties) {
                properties.put("gamma", gamma);
                properties.put("white_point_x", chromaticity[0]);
                properties.put("white_point_y", chromaticity[1]);
                properties.put("red_x", chromaticity[2]);
                properties.put("red_y", chromaticity[3]);
                properties.put("green_x", chromaticity[4]);
                properties.put("green_y", chromaticity[5]);
                properties.put("blue_x", chromaticity[6]);
                properties.put("blue_y", chromaticity[7]);
            }
        }
    }
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batik-codec/src/main/java/org/apache/batik/ext/awt/image/codec/png/PNGRed.java [1194:1230]:
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    private void parse_sRGB_chunk(PNGChunk chunk) {
        sRGBRenderingIntent = chunk.getByte(0);

        // The presence of an sRGB chunk implies particular
        // settings for gamma and chroma.
        fileGamma = 45455/100000.0F;

        chromaticity = new float[8];
        chromaticity[0] = 31270/10000.0F;
        chromaticity[1] = 32900/10000.0F;
        chromaticity[2] = 64000/10000.0F;
        chromaticity[3] = 33000/10000.0F;
        chromaticity[4] = 30000/10000.0F;
        chromaticity[5] = 60000/10000.0F;
        chromaticity[6] = 15000/10000.0F;
        chromaticity[7] =  6000/10000.0F;

        if (performGammaCorrection) {
            // File gamma is 1/2.2
            float gamma = fileGamma*(displayExponent/userExponent);
            if (encodeParam != null) {
                encodeParam.setGamma(gamma);
                encodeParam.setChromaticity(chromaticity);
            }
            if (emitProperties) {
                properties.put("gamma", gamma);
                properties.put("white_point_x", chromaticity[0]);
                properties.put("white_point_y", chromaticity[1]);
                properties.put("red_x", chromaticity[2]);
                properties.put("red_y", chromaticity[3]);
                properties.put("green_x", chromaticity[4]);
                properties.put("green_y", chromaticity[5]);
                properties.put("blue_x", chromaticity[6]);
                properties.put("blue_y", chromaticity[7]);
            }
        }
    }
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