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    <p>You can always create a <code>BufferedImage</code>, draw whatever needs to be grey-scaled to the <code>Graphics</code> object for that image using <code>bufferedImage.createGraphics()</code>, and then use the <code>javax.swing.GreyFilter</code> to create a grey-scaled copy of the image.</p> <p><a href="http://journals.ecs.soton.ac.uk/java/tutorial/ui/drawing/useFilter.html" rel="nofollow">This page shows you how to use a <code>Filter</code></a>.</p> <p>You might also want to compare your approach with SwingX's <code>BlendComposite</code>, which I expect does the same thing as you are doing. BlendComposite has a Saturation mode that would allow grey-scale. (It also has more modes.)</p> <p><a href="http://www.java2s.com/Code/Java/2D-Graphics-GUI/BlendCompositeDemo.htm" rel="nofollow">This page has a demo of BlendComposite.</a></p> <p>About efficiency, I expect there's no important difference between them, because there's intermediate steps, and from what I can see, complete copies of the image data with both. But if you retain the grey-scaled image using the first method I suggested, you can prevent recalculation of non-dynamic controls.</p> <p>If you do one of the above, the performance will be correct, and I expect that's what you really want.</p> <p>From your comments I guess you might just want to apply the effect to a component. For this you could use <code>JLayer</code>, only available in Java 7. From the <a href="http://docs.oracle.com/javase/7/docs/api/javax/swing/JLayer.html" rel="nofollow">Javadoc</a> there is an example of overlaying a translucent green. You could replace this with grey. If you want to use JLayer in previous versions of Java you could use <code>JXLayer</code>, part of the SwingX project.</p>
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    1. POHow can I implement java.awt.Composite efficiently?
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    1. POHow can I implement java.awt.Composite efficiently?
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    1. COBlendComposite looks like a useful Tool, thanks for the hint. Although from a quick glance it seems as if does not work with every possible ColorModel in its compose()-method, probably other ColorModels are not relevant in practice?. As for "You can always create a BufferedImage", I don't see how I could do that in the compose()-method implementatin. Doing it somewhere in paintComponent() would be possible, but its a lot less flexible than just setting the Composite and then proceed with the normal rendering chain.
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    2. CO@Durandal I don't know whether it's suitable for all color models (and I don't really know what ColorModel is used for in this context, although I can guess), what I do know, and the reason I suggested it, is SwingX has/had input from the official Swing team, so it should be flexible for common uses. With my first suggestion, you wouldn't use Composite, and I would do it in paintComponent -- it's just as flexible, just more work (create the image to the drawing size, draw to it, filter it, paint it; and cache the last one to use if the size is the same)....
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    3. CO@Durandal you could create the `Graphics` for the BufferedImage and then call `paintComponent` with that graphics instance.
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