e665. 在图像中过滤三元色

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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e665. 在图像中过滤三元色

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