Examples of java.awt.image.ImageFilter

java.awt.image.ImageFilter
This class implements a filter for the set of interface methods that are used to deliver data from an ImageProducer to an ImageConsumer. It is meant to be used in conjunction with a FilteredImageSource object to produce filtered versions of existing images. It is a base class that provides the calls needed to implement a "Null filter" which has no effect on the data being passed through. Filters should subclass this class and override the methods which deal with the data that needs to be filtered and modify it as necessary. @see FilteredImageSource @see ImageConsumer @version 1.32 11/17/05 @author Jim Graham

    public synchronized void addConsumer(ImageConsumer ic) {
  if (proxies == null) {
      proxies = new Hashtable();
  }
  if (!proxies.containsKey(ic)) {
      ImageFilter imgf = filter.getFilterInstance(ic);
      proxies.put(ic, imgf);
      src.addConsumer(imgf);
  }
    }

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     *
     * @see ImageConsumer
     */
    public synchronized void removeConsumer(ImageConsumer ic) {
  if (proxies != null) {
      ImageFilter imgf = (ImageFilter) proxies.get(ic);
      if (imgf != null) {
    src.removeConsumer(imgf);
    proxies.remove(ic);
    if (proxies.isEmpty()) {
        proxies = null;

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     */
    public void startProduction(ImageConsumer ic) {
  if (proxies == null) {
      proxies = new Hashtable();
  }
  ImageFilter imgf = (ImageFilter) proxies.get(ic);
  if (imgf == null) {
      imgf = filter.getFilterInstance(ic);
      proxies.put(ic, imgf);
  }
  src.startProduction(imgf);

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     *
     * @see ImageConsumer
     */
    public void requestTopDownLeftRightResend(ImageConsumer ic) {
  if (proxies != null) {
      ImageFilter imgf = (ImageFilter) proxies.get(ic);
      if (imgf != null) {
    imgf.resendTopDownLeftRight(src);
      }
  }
    }

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                    // use grey as an index into the colormap;
                    spectrogram.setRGB(i, maxYIndex - j, cmap.getColor(grey));
                }
            }


            ImageFilter scaleFilter = 
                new ReplicateScaleFilter((int) (zoom * width), (int)(vzoom*height));
            scaledSpectrogram = 
                createImage(new FilteredImageSource(spectrogram.getSource(),
                                                    scaleFilter));
            Dimension sz = getSize();

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            // do the zooming
            width = (int) (zoom * width);
            height = (int)(vzoom*height);


            ImageFilter scaleFilter = 
                new ReplicateScaleFilter(width, height);
            scaledSpectrogram = 
                createImage(new FilteredImageSource(spectrogram.getSource(),
                                                    scaleFilter));

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      return null;
    }


    // Get the colorizing filter
    int[] targetColors = _getTargetColors(requestedProperties);
    ImageFilter filter = new ColorizingFilter(_SOURCE_COLORS, targetColors);


    Toolkit toolkit = Toolkit.getDefaultToolkit();
    ImageProducer producer = icon.getSource();


    // If direction is RTL, flip the source image

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                    // use grey as an index into the colormap;
                    spectrogram.setRGB(i, maxYIndex - j, cmap.getColor(grey));
                }
            }


            ImageFilter scaleFilter = 
                new ReplicateScaleFilter((int) (zoom * width), (int)(vzoom*height));
            scaledSpectrogram = 
                createImage(new FilteredImageSource(spectrogram.getSource(),
                                                    scaleFilter));
            Dimension sz = getSize();

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            // do the zooming
            width = (int) (zoom * width);
            height = (int)(vzoom*height);


            ImageFilter scaleFilter = 
                new ReplicateScaleFilter(width, height);
            scaledSpectrogram = 
                createImage(new FilteredImageSource(spectrogram.getSource(),
                                                    scaleFilter));

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    }


    public static java.awt.Image makeGrayTransparent(byte[] imageData) {
        Toolkit toolkit = Toolkit.getDefaultToolkit();
        java.awt.Image img = toolkit.createImage(imageData);
        ImageFilter filter = new RGBImageFilter() {


                public final int filterRGB(int x, int y, int rgb)
                {
                    int r = (rgb & 0xFF0000) >> 16;
                    int g = (rgb & 0xFF00) >> 8;

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