src/main/java/org/apache/xmlgraphics/image/codec/png/PNGImageDecoder.java [209:273]:
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    private static final int POST_NONE = 0;

    // Gamma correct only
    private static final int POST_GAMMA = 1;

    // Push gray values through grayLut to expand to 8 bits
    private static final int POST_GRAY_LUT = 2;

    // Push gray values through grayLut to expand to 8 bits, add alpha
    private static final int POST_GRAY_LUT_ADD_TRANS = 3;

    // Push palette value through R,G,B lookup tables
    private static final int POST_PALETTE_TO_RGB = 4;

    // Push palette value through R,G,B,A lookup tables
    private static final int POST_PALETTE_TO_RGBA = 5;

    // Add transparency to a given gray value (w/ optional gamma)
    private static final int POST_ADD_GRAY_TRANS = 6;

    // Add transparency to a given RGB value (w/ optional gamma)
    private static final int POST_ADD_RGB_TRANS = 7;

    // Remove the alpha channel from a gray image (w/ optional gamma)
    private static final int POST_REMOVE_GRAY_TRANS = 8;

    // Remove the alpha channel from an RGB image (w/optional gamma)
    private static final int POST_REMOVE_RGB_TRANS = 9;

    // Mask to add expansion of GA -> GGGA
    private static final int POST_EXP_MASK = 16;

    // Expand gray to G/G/G
    private static final int POST_GRAY_ALPHA_EXP =
        POST_NONE | POST_EXP_MASK;

    // Expand gray to G/G/G through a gamma lut
    private static final int POST_GAMMA_EXP =
        POST_GAMMA | POST_EXP_MASK;

    // Push gray values through grayLut to expand to 8 bits, expand, add alpha
    private static final int POST_GRAY_LUT_ADD_TRANS_EXP =
        POST_GRAY_LUT_ADD_TRANS | POST_EXP_MASK;

    // Add transparency to a given gray value, expand
    private static final int POST_ADD_GRAY_TRANS_EXP =
        POST_ADD_GRAY_TRANS | POST_EXP_MASK;

    private List<InputStream> streamVec = new ArrayList<InputStream>();
    private DataInputStream dataStream;

    private int bytesPerPixel; // number of bytes per input pixel
    private int inputBands;
    private int outputBands;

    // Number of private chunks
    private int chunkIndex;

    private List textKeys = new ArrayList();
    private List textStrings = new ArrayList();

    private List ztextKeys = new ArrayList();
    private List ztextStrings = new ArrayList();

    private WritableRaster theTile;
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src/main/java/org/apache/xmlgraphics/image/codec/png/PNGRed.java [240:304]:
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    private static final int POST_NONE = 0;

    // Gamma correct only
    private static final int POST_GAMMA = 1;

    // Push gray values through grayLut to expand to 8 bits
    private static final int POST_GRAY_LUT = 2;

    // Push gray values through grayLut to expand to 8 bits, add alpha
    private static final int POST_GRAY_LUT_ADD_TRANS = 3;

    // Push palette value through R,G,B lookup tables
    private static final int POST_PALETTE_TO_RGB = 4;

    // Push palette value through R,G,B,A lookup tables
    private static final int POST_PALETTE_TO_RGBA = 5;

    // Add transparency to a given gray value (w/ optional gamma)
    private static final int POST_ADD_GRAY_TRANS = 6;

    // Add transparency to a given RGB value (w/ optional gamma)
    private static final int POST_ADD_RGB_TRANS = 7;

    // Remove the alpha channel from a gray image (w/ optional gamma)
    private static final int POST_REMOVE_GRAY_TRANS = 8;

    // Remove the alpha channel from an RGB image (w/optional gamma)
    private static final int POST_REMOVE_RGB_TRANS = 9;

    // Mask to add expansion of GA -> GGGA
    private static final int POST_EXP_MASK = 16;

    // Expand gray to G/G/G
    private static final int POST_GRAY_ALPHA_EXP =
        POST_NONE | POST_EXP_MASK;

    // Expand gray to G/G/G through a gamma lut
    private static final int POST_GAMMA_EXP =
        POST_GAMMA | POST_EXP_MASK;

    // Push gray values through grayLut to expand to 8 bits, expand, add alpha
    private static final int POST_GRAY_LUT_ADD_TRANS_EXP =
        POST_GRAY_LUT_ADD_TRANS | POST_EXP_MASK;

    // Add transparency to a given gray value, expand
    private static final int POST_ADD_GRAY_TRANS_EXP =
        POST_ADD_GRAY_TRANS | POST_EXP_MASK;

    private List<InputStream> streamVec = new ArrayList<InputStream>();
    private DataInputStream dataStream;

    private int bytesPerPixel; // number of bytes per input pixel
    private int inputBands;
    private int outputBands;

    // Number of private chunks
    private int chunkIndex;

    private List textKeys = new ArrayList();
    private List textStrings = new ArrayList();

    private List ztextKeys = new ArrayList();
    private List ztextStrings = new ArrayList();

    private WritableRaster theTile;
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