This example demonstrates how to create a filter that can modify any of the RGB pixel values in an image.
// This filter removes all but the red values in an image
class GetRedFilter extends RGBImageFilter {
public GetRedFilter() {
// When this is set to true, the filter will work with images
// whose pixels are indices into a color table (IndexColorModel).
// In such a case, the color values in the color table are filtered.
canFilterIndexColorModel = true;
} // This method is called for every pixel in the image
public int filterRGB(int x, int y, int rgb) {
if (x == -1) {
// The pixel value is from the image's color table rather than the image itself
}
// Return only the red component
return rgb & 0xffff0000;
}
}
Here's some code that uses the filter:
// Get image
Image image = new ImageIcon("image.gif").getImage(); // Create the filter
ImageFilter filter = new GetRedFilter();
FilteredImageSource filteredSrc = new FilteredImageSource(image.getSource(), filter); // Create the filtered image
image = Toolkit.getDefaultToolkit().createImage(filteredSrc);
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