[Chapter 21] 21.13 java.awt.image.RGBImageFilter (JDK 1.0)

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| Chapter 21 The java.awt.image Package |

## 21.13 java.awt.image.RGBImageFilter (JDK 1.0)

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This abstract class is an `ImageFilter` that provides an easy way to implement filters that modify the colors of an image. To create a color filter that modifies the colors of an image, you should subclass `RGBImageFilter` and provide a definition of `filterRGB()` that converts the input pixel value (in the default RGB color model) to an output value. If the conversion does not depend on the location of the pixel, set the `canFilterIndexColorModel` variable to `true` so that the `RGBImageFilter` can save time by filtering the colormap of an image that uses an `IndexColorModel` instead of filtering each pixel of the image.

    public abstract class RGBImageFilter extends ImageFilter {
        // Default Constructor: public RGBImageFilter()
        // Protected Instance Variables
                protected boolean canFilterIndexColorModel;
                protected ColorModel newmodel;
                protected ColorModel origmodel;
        // Public Instance Methods
                public IndexColorModel filterIndexColorModel(IndexColorModel icm);
                public abstract int filterRGB(int x, int y, int rgb);
                public void filterRGBPixels(int x, int y, int w, int h, int[] pixels, int off, int scansize);
                public void setColorModel(ColorModel model);  // Overrides ImageFilter
                public void setPixels(int x, int y, int w, int h, ColorModel model,
                public void setPixels'u'byte[] pixels, int off, int scansize);  // Overrides ImageFilter
                public void setPixels(int x, int y, int w, int h, ColorModel model,
                public void setPixels'u'int[] pixels, int off, int scansize);  // Overrides ImageFilter
                public void substituteColorModel(ColorModel oldcm, ColorModel newcm);
    }

### Hierarchy:

`Object->ImageFilter(ImageConsumer, Cloneable)->RGBImageFilter`

java.awt.image.PixelGrabber (JDK 1.0) |  | java.awt.image.ReplicateScaleFilter (JDK 1.1)