src/main/java/org/apache/xmlgraphics/image/codec/png/PNGImageDecoder.java [774:987]:
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    private static final int[] GrayBits8 = { 8 };
    private static final ComponentColorModel colorModelGray8 =
        new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_GRAY),
                                GrayBits8, false, false,
                                Transparency.OPAQUE,
                                DataBuffer.TYPE_BYTE);

    private static final int[] GrayAlphaBits8 = { 8, 8 };
    private static final ComponentColorModel colorModelGrayAlpha8 =
        new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_GRAY),
                                GrayAlphaBits8, true, false,
                                Transparency.TRANSLUCENT,
                                DataBuffer.TYPE_BYTE);

    private static final int[] GrayBits16 = { 16 };
    private static final ComponentColorModel colorModelGray16 =
        new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_GRAY),
                                GrayBits16, false, false,
                                Transparency.OPAQUE,
                                DataBuffer.TYPE_USHORT);

    private static final int[] GrayAlphaBits16 = { 16, 16 };
    private static final ComponentColorModel colorModelGrayAlpha16 =
        new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_GRAY),
                                GrayAlphaBits16, true, false,
                                Transparency.TRANSLUCENT,
                                DataBuffer.TYPE_USHORT);

    private static final int[] GrayBits32 = { 32 };
    private static final ComponentColorModel colorModelGray32 =
        new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_GRAY),
                                GrayBits32, false, false,
                                Transparency.OPAQUE,
                                DataBuffer.TYPE_INT);

    private static final int[] GrayAlphaBits32 = { 32, 32 };
    private static final ComponentColorModel colorModelGrayAlpha32 =
        new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_GRAY),
                                GrayAlphaBits32, true, false,
                                Transparency.TRANSLUCENT,
                                DataBuffer.TYPE_INT);

    private static final int[] RGBBits8 = { 8, 8, 8 };
    private static final ComponentColorModel colorModelRGB8 =
      new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
                              RGBBits8, false, false,
                              Transparency.OPAQUE,
                              DataBuffer.TYPE_BYTE);

    private static final int[] RGBABits8 = { 8, 8, 8, 8 };
    private static final ComponentColorModel colorModelRGBA8 =
      new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
                              RGBABits8, true, false,
                              Transparency.TRANSLUCENT,
                              DataBuffer.TYPE_BYTE);

    private static final int[] RGBBits16 = { 16, 16, 16 };
    private static final ComponentColorModel colorModelRGB16 =
      new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
                              RGBBits16, false, false,
                              Transparency.OPAQUE,
                              DataBuffer.TYPE_USHORT);

    private static final int[] RGBABits16 = { 16, 16, 16, 16 };
    private static final ComponentColorModel colorModelRGBA16 =
      new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
                              RGBABits16, true, false,
                              Transparency.TRANSLUCENT,
                              DataBuffer.TYPE_USHORT);

    private static final int[] RGBBits32 = { 32, 32, 32 };
    private static final ComponentColorModel colorModelRGB32 =
      new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
                              RGBBits32, false, false,
                              Transparency.OPAQUE,
                              DataBuffer.TYPE_INT);

    private static final int[] RGBABits32 = { 32, 32, 32, 32 };
    private static final ComponentColorModel colorModelRGBA32 =
      new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
                              RGBABits32, true, false,
                              Transparency.TRANSLUCENT,
                              DataBuffer.TYPE_INT);
    /**
     * A convenience method to create an instance of
     * <code>ComponentColorModel</code> suitable for use with the
     * given <code>SampleModel</code>.  The <code>SampleModel</code>
     * should have a data type of <code>DataBuffer.TYPE_BYTE</code>,
     * <code>TYPE_USHORT</code>, or <code>TYPE_INT</code> and between
     * 1 and 4 bands.  Depending on the number of bands of the
     * <code>SampleModel</code>, either a gray, gray+alpha, rgb, or
     * rgb+alpha <code>ColorModel</code> is returned.
     */
    public static ColorModel createComponentColorModel(SampleModel sm) {
        int type = sm.getDataType();
        int bands = sm.getNumBands();
        ComponentColorModel cm = null;

        if (type == DataBuffer.TYPE_BYTE) {
            switch (bands) {
            case 1:
                cm = colorModelGray8;
                break;
            case 2:
                cm = colorModelGrayAlpha8;
                break;
            case 3:
                cm = colorModelRGB8;
                break;
            case 4:
                cm = colorModelRGBA8;
                break;
            }
        } else if (type == DataBuffer.TYPE_USHORT) {
            switch (bands) {
            case 1:
                cm = colorModelGray16;
                break;
            case 2:
                cm = colorModelGrayAlpha16;
                break;
            case 3:
                cm = colorModelRGB16;
                break;
            case 4:
                cm = colorModelRGBA16;
                break;
            }
        } else if (type == DataBuffer.TYPE_INT) {
            switch (bands) {
            case 1:
                cm = colorModelGray32;
                break;
            case 2:
                cm = colorModelGrayAlpha32;
                break;
            case 3:
                cm = colorModelRGB32;
                break;
            case 4:
                cm = colorModelRGBA32;
                break;
            }
        }

        return cm;
    }

    private void parse_PLTE_chunk(PNGChunk chunk) {
        paletteEntries = chunk.getLength() / 3;
        redPalette = new byte[paletteEntries];
        greenPalette = new byte[paletteEntries];
        bluePalette = new byte[paletteEntries];

        int pltIndex = 0;

        // gAMA chunk must precede PLTE chunk
        if (performGammaCorrection) {
            if (gammaLut == null) {
                initGammaLut(bitDepth == 16 ? 16 : 8);
            }

            for (int i = 0; i < paletteEntries; i++) {
                byte r = chunk.getByte(pltIndex++);
                byte g = chunk.getByte(pltIndex++);
                byte b = chunk.getByte(pltIndex++);

                redPalette[i] = (byte)gammaLut[r & 0xff];
                greenPalette[i] = (byte)gammaLut[g & 0xff];
                bluePalette[i] = (byte)gammaLut[b & 0xff];
            }
        } else {
            for (int i = 0; i < paletteEntries; i++) {
                redPalette[i] = chunk.getByte(pltIndex++);
                greenPalette[i] = chunk.getByte(pltIndex++);
                bluePalette[i] = chunk.getByte(pltIndex++);
            }
        }
    }

    private void parse_bKGD_chunk(PNGChunk chunk) {
        switch (colorType) {
        case PNG_COLOR_PALETTE:
            int bkgdIndex = chunk.getByte(0) & 0xff;

            bkgdRed = redPalette[bkgdIndex] & 0xff;
            bkgdGreen = greenPalette[bkgdIndex] & 0xff;
            bkgdBlue = bluePalette[bkgdIndex] & 0xff;

            if (encodeParam != null) {
                ((PNGEncodeParam.Palette)encodeParam).setBackgroundPaletteIndex(bkgdIndex);
            }
            break;
        case PNG_COLOR_GRAY: case PNG_COLOR_GRAY_ALPHA:
            int bkgdGray = chunk.getInt2(0);
            bkgdRed = bkgdGreen = bkgdBlue = bkgdGray;

            if (encodeParam != null) {
                ((PNGEncodeParam.Gray)encodeParam).setBackgroundGray(bkgdGray);
            }
            break;
        case PNG_COLOR_RGB: case PNG_COLOR_RGB_ALPHA:
            bkgdRed = chunk.getInt2(0);
            bkgdGreen = chunk.getInt2(2);
            bkgdBlue = chunk.getInt2(4);

            int[] bkgdRGB = new int[3];
            bkgdRGB[0] = bkgdRed;
            bkgdRGB[1] = bkgdGreen;
            bkgdRGB[2] = bkgdBlue;
            if (encodeParam != null) {
                ((PNGEncodeParam.RGB)encodeParam).setBackgroundRGB(bkgdRGB);
            }
            break;
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src/main/java/org/apache/xmlgraphics/image/codec/png/PNGRed.java [829:1042]:
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    private static final int[] GrayBits8 = { 8 };
    private static final ComponentColorModel colorModelGray8 =
        new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_GRAY),
                                GrayBits8, false, false,
                                Transparency.OPAQUE,
                                DataBuffer.TYPE_BYTE);

    private static final int[] GrayAlphaBits8 = { 8, 8 };
    private static final ComponentColorModel colorModelGrayAlpha8 =
        new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_GRAY),
                                GrayAlphaBits8, true, false,
                                Transparency.TRANSLUCENT,
                                DataBuffer.TYPE_BYTE);

    private static final int[] GrayBits16 = { 16 };
    private static final ComponentColorModel colorModelGray16 =
        new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_GRAY),
                                GrayBits16, false, false,
                                Transparency.OPAQUE,
                                DataBuffer.TYPE_USHORT);

    private static final int[] GrayAlphaBits16 = { 16, 16 };
    private static final ComponentColorModel colorModelGrayAlpha16 =
        new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_GRAY),
                                GrayAlphaBits16, true, false,
                                Transparency.TRANSLUCENT,
                                DataBuffer.TYPE_USHORT);

    private static final int[] GrayBits32 = { 32 };
    private static final ComponentColorModel colorModelGray32 =
        new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_GRAY),
                                GrayBits32, false, false,
                                Transparency.OPAQUE,
                                DataBuffer.TYPE_INT);

    private static final int[] GrayAlphaBits32 = { 32, 32 };
    private static final ComponentColorModel colorModelGrayAlpha32 =
        new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_GRAY),
                                GrayAlphaBits32, true, false,
                                Transparency.TRANSLUCENT,
                                DataBuffer.TYPE_INT);

    private static final int[] RGBBits8 = { 8, 8, 8 };
    private static final ComponentColorModel colorModelRGB8 =
      new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
                              RGBBits8, false, false,
                              Transparency.OPAQUE,
                              DataBuffer.TYPE_BYTE);

    private static final int[] RGBABits8 = { 8, 8, 8, 8 };
    private static final ComponentColorModel colorModelRGBA8 =
      new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
                              RGBABits8, true, false,
                              Transparency.TRANSLUCENT,
                              DataBuffer.TYPE_BYTE);

    private static final int[] RGBBits16 = { 16, 16, 16 };
    private static final ComponentColorModel colorModelRGB16 =
      new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
                              RGBBits16, false, false,
                              Transparency.OPAQUE,
                              DataBuffer.TYPE_USHORT);

    private static final int[] RGBABits16 = { 16, 16, 16, 16 };
    private static final ComponentColorModel colorModelRGBA16 =
      new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
                              RGBABits16, true, false,
                              Transparency.TRANSLUCENT,
                              DataBuffer.TYPE_USHORT);

    private static final int[] RGBBits32 = { 32, 32, 32 };
    private static final ComponentColorModel colorModelRGB32 =
      new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
                              RGBBits32, false, false,
                              Transparency.OPAQUE,
                              DataBuffer.TYPE_INT);

    private static final int[] RGBABits32 = { 32, 32, 32, 32 };
    private static final ComponentColorModel colorModelRGBA32 =
      new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
                              RGBABits32, true, false,
                              Transparency.TRANSLUCENT,
                              DataBuffer.TYPE_INT);
    /**
     * A convenience method to create an instance of
     * <code>ComponentColorModel</code> suitable for use with the
     * given <code>SampleModel</code>.  The <code>SampleModel</code>
     * should have a data type of <code>DataBuffer.TYPE_BYTE</code>,
     * <code>TYPE_USHORT</code>, or <code>TYPE_INT</code> and between
     * 1 and 4 bands.  Depending on the number of bands of the
     * <code>SampleModel</code>, either a gray, gray+alpha, rgb, or
     * rgb+alpha <code>ColorModel</code> is returned.
     */
    public static ColorModel createComponentColorModel(SampleModel sm) {
        int type = sm.getDataType();
        int bands = sm.getNumBands();
        ComponentColorModel cm = null;

        if (type == DataBuffer.TYPE_BYTE) {
            switch (bands) {
            case 1:
                cm = colorModelGray8;
                break;
            case 2:
                cm = colorModelGrayAlpha8;
                break;
            case 3:
                cm = colorModelRGB8;
                break;
            case 4:
                cm = colorModelRGBA8;
                break;
            }
        } else if (type == DataBuffer.TYPE_USHORT) {
            switch (bands) {
            case 1:
                cm = colorModelGray16;
                break;
            case 2:
                cm = colorModelGrayAlpha16;
                break;
            case 3:
                cm = colorModelRGB16;
                break;
            case 4:
                cm = colorModelRGBA16;
                break;
            }
        } else if (type == DataBuffer.TYPE_INT) {
            switch (bands) {
            case 1:
                cm = colorModelGray32;
                break;
            case 2:
                cm = colorModelGrayAlpha32;
                break;
            case 3:
                cm = colorModelRGB32;
                break;
            case 4:
                cm = colorModelRGBA32;
                break;
            }
        }

        return cm;
    }

    private void parse_PLTE_chunk(PNGChunk chunk) {
        paletteEntries = chunk.getLength() / 3;
        redPalette = new byte[paletteEntries];
        greenPalette = new byte[paletteEntries];
        bluePalette = new byte[paletteEntries];

        int pltIndex = 0;

        // gAMA chunk must precede PLTE chunk
        if (performGammaCorrection) {
            if (gammaLut == null) {
                initGammaLut(bitDepth == 16 ? 16 : 8);
            }

            for (int i = 0; i < paletteEntries; i++) {
                byte r = chunk.getByte(pltIndex++);
                byte g = chunk.getByte(pltIndex++);
                byte b = chunk.getByte(pltIndex++);

                redPalette[i]   = (byte)gammaLut[r & 0xff];
                greenPalette[i] = (byte)gammaLut[g & 0xff];
                bluePalette[i]  = (byte)gammaLut[b & 0xff];
            }
        } else {
            for (int i = 0; i < paletteEntries; i++) {
                redPalette[i] = chunk.getByte(pltIndex++);
                greenPalette[i] = chunk.getByte(pltIndex++);
                bluePalette[i] = chunk.getByte(pltIndex++);
            }
        }
    }

    private void parse_bKGD_chunk(PNGChunk chunk) {
        switch (colorType) {
        case PNG_COLOR_PALETTE:
            int bkgdIndex = chunk.getByte(0) & 0xff;

            bkgdRed   = redPalette[bkgdIndex]   & 0xff;
            bkgdGreen = greenPalette[bkgdIndex] & 0xff;
            bkgdBlue  = bluePalette[bkgdIndex]  & 0xff;

            if (encodeParam != null) {
                ((PNGEncodeParam.Palette)encodeParam).setBackgroundPaletteIndex(bkgdIndex);
            }
            break;
        case PNG_COLOR_GRAY: case PNG_COLOR_GRAY_ALPHA:
            int bkgdGray = chunk.getInt2(0);
            bkgdRed = bkgdGreen = bkgdBlue = bkgdGray;

            if (encodeParam != null) {
                ((PNGEncodeParam.Gray)encodeParam).setBackgroundGray(bkgdGray);
            }
            break;
        case PNG_COLOR_RGB: case PNG_COLOR_RGB_ALPHA:
            bkgdRed = chunk.getInt2(0);
            bkgdGreen = chunk.getInt2(2);
            bkgdBlue = chunk.getInt2(4);

            int[] bkgdRGB = new int[3];
            bkgdRGB[0] = bkgdRed;
            bkgdRGB[1] = bkgdGreen;
            bkgdRGB[2] = bkgdBlue;
            if (encodeParam != null) {
                ((PNGEncodeParam.RGB)encodeParam).setBackgroundRGB(bkgdRGB);
            }
            break;
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