Examples of java.awt.image.BandCombineOp.filter()

java.awt.image.BandCombineOp.filter()
Transforms the Raster using the matrix specified in the constructor. An IllegalArgumentException may be thrown if the number of bands in the source or destination is incompatible with the matrix. See the class comments for more details.
If the destination is null, it will be created with a number of bands equalling the number of rows in the matrix. No exception is thrown if the operation causes a data overflow. @param src The Raster to be filtered. @param dst The Raster in which to store the results of the filter operation. @return The filtered Raster. @throws IllegalArgumentException If the number of bands in the source or destination is incompatible with the matrix.

                matrix[3][3] = 1; // Alpha
                break;
            }
            Raster srcRas = src.getData(wr.getBounds());
            BandCombineOp op = new BandCombineOp(matrix, null);
            op.filter(srcRas, wr);
        } else {
            ColorModel dstCM = getColorModel();
            if (srcCM.getColorSpace() == dstCM.getColorSpace()) {
                // No transform needed, just reformat data...
                // System.out.println("Bypassing");

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            // System.out.println("src: " + srcBI.getWidth() + "x" + 
            //                    srcBI.getHeight());


            ColorConvertOp op = new ColorConvertOp(dstCM.getColorSpace(), 
                                                   null);
            dstBI = op.filter(srcBI, null);


            // System.out.println("After filter:");
            
            WritableRaster wr00 = wr.createWritableTranslatedChild(0,0);
            for (int i=0; i<dstCM.getColorSpace().getNumComponents(); i++)

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                matrix[0][0] = 1;
            }


            Raster srcRas = src.getData(wr.getBounds());
            BandCombineOp op = new BandCombineOp(matrix, null);
            op.filter(srcRas, wr);
        } else {
            Raster         srcRas = src.getData(wr.getBounds());
            WritableRaster srcWr  = (WritableRaster)srcRas;


            // Divide out alpha if we have it.  We need to do this since

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                dstBI = new BufferedImage(cmna, dstWr, false, null);
            }


            ColorConvertOp op = new ColorConvertOp(null);
            op.filter(srcBI, dstBI);


            // I never have to 'fix' alpha premult since I take
            // it's value from my source....
            if (dstCM.hasAlpha())
                copyBand(srcWr, sm.getNumBands()-1,

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                    BufferedImage mask;
                    mask = new BufferedImage(src.getWidth(), src.getHeight(), BufferedImage.TYPE_INT_ARGB);
                    float[][] matrix = new float[][]{{0, 0, 0, 0}, {0, 0, 0, 0},
                        {0, 0, 0, 0}, {0.299f, 0.587f, 0.114f, 0}};
                    BandCombineOp bandOp = new BandCombineOp(matrix, null);
                    bandOp.filter(src.getRaster(), mask.getRaster());
                    src = mask;
                }
            }
            Composite composite = findComposite(op);
            graphics.setComposite(composite);

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            // Mostly just a hack. Ignores numberColors and more.
            // TODO What should the alpha be? And even for this, why does 255 work? Shouldn't it be 1?
            float[][] matrix = new float[][]{{0.299f, 0.587f, 0.114f, 0},
                {0.299f, 0.587f, 0.114f, 0}, {0.299f, 0.587f, 0.114f, 0}, {0, 0, 0, 255}};
            BandCombineOp bandOp = new BandCombineOp(matrix, null);
            bandOp.filter(getImage().getRaster(), result.getImage().getRaster());
        } else {
            // Um, obviously wrong here.
            result.composite(this, 0, 0, CompositeOperator.OVER);
        }
        result.setFormat(this.getFormat());

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        BufferedImage srcBI = new BufferedImage(cm,
                                                srcWR,
                                                cm.isAlphaPremultiplied(),
                                                null);*/


        WritableRaster dstWR = op.filter(srcWR, srcWR);


        BufferedImage dstBI = new BufferedImage(cm,
                                                dstWR,
                                                cm.isAlphaPremultiplied(),
                                                null);

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                matrix[0][0] = 1;
            }


            Raster srcRas = src.getData(wr.getBounds());
            BandCombineOp op = new BandCombineOp(matrix, null);
            op.filter(srcRas, wr);
        } else {
            // REVIEW: Alpha handling may not be correct through here.
            // Since the colorconversion may not be a linear op it
            // is probably required to divide out the alpha before
            // doing the color conversion.

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                 new int [] {8}, false, false,
                 Transparency.OPAQUE, 
                 DataBuffer.TYPE_BYTE);


            dstBI = new BufferedImage(cmna, dstWr, false, null);
            op.filter(srcBI, dstBI);


            // I never have to 'fix' alpha premult since I take
            // it's value from my source....
            if (cm.hasAlpha() && getColorModel().hasAlpha())
                copyBand(srcWr, sm.getNumBands()-1,

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                matrix[3][3] = 1; // Alpha
                break;
            }
            Raster srcRas = src.getData(wr.getBounds());
            BandCombineOp op = new BandCombineOp(matrix, null);
            op.filter(srcRas, wr);
            return wr;
        }


        if (srcCM.getColorSpace() ==
            ColorSpace.getInstance(ColorSpace.CS_GRAY)) {

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