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    <p>Summary: The original <a href="http://www.javalobby.org/java/forums/t21355.html" rel="nofollow noreferrer"><code>JScrollNavigator</code></a> uses the Swing <a href="http://java.sun.com/products/jfc/tsc/articles/painting/index.html#props" rel="nofollow noreferrer"><code>opacity</code></a> property to render a convenient green <code>NavBox</code> over a scaled thumbnail of the component in an adjacent <code>JScrollPane</code>. Because it extends <code>JPanel</code>, the (shared) UI delegate's use of <code>opacity</code> conflicts with that of the scrollable component. The images seen in edit 5 above typify the associated rendering artifact, also shown <a href="https://stackoverflow.com/q/7213178/230513">here</a>. The solution is to let <code>NavBox</code>, <code>JScrollNavigator</code> and the scrollable component extend <code>JComponent</code>, as suggested in the second addendum below. Each component can then manage it's own properties individually.</p> <p><img src="https://i.stack.imgur.com/TpGg0.png" alt="enter image description here"></p> <p>I see no unusual rendering artifact with your <a href="http://wklej.to/RnkO1" rel="nofollow noreferrer">code as posted</a> on my platform, Mac OS X, Java 1.6. Sorry, I don't see any glaring portability violations.</p> <p><img src="https://i.stack.imgur.com/wlCUQ.png" alt="image one"></p> <p>A few probably irrelevant, but perhaps useful, observations.</p> <ul> <li><p>Even if you use <code>setSize()</code>, appropriately in this case, you should still <code>pack()</code> the enclosing <code>Window</code>.</p> <pre><code>f.pack(); f.setSize(300, 200); </code></pre></li> <li><p>For convenience, <code>add()</code> forwards the component to the content pane.</p> <pre><code>f.add(nav, BorderLayout.WEST); </code></pre></li> <li><p>Prefer <code>StringBuilder</code> to <code>StringBuffer</code>.</p></li> <li><p>Consider <code>ComponentAdapter</code> in place of <code>ComponentListener</code>.</p></li> </ul> <p>Addendum: As suggested <a href="https://stackoverflow.com/a/6916719/230513">here</a>, I got somewhat more flexible results using <code>RenderingHints</code> instead of <code>getScaledInstance()</code> as shown below. Adding a few icons makes it easier to see the disparate effect on images and text.</p> <p><img src="https://i.stack.imgur.com/P0QIy.png" alt="image two"></p> <pre><code>editPane.insertIcon(UIManager.getIcon("OptionPane.errorIcon")); editPane.insertIcon(UIManager.getIcon("OptionPane.warningIcon")); ... @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Component view = jScrollPane.getViewport().getView(); BufferedImage img = new BufferedImage(view.getWidth(), view.getHeight(), BufferedImage.TYPE_INT_ARGB); Graphics2D off = img.createGraphics(); off.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); off.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC); view.paint(off); Graphics2D on = (Graphics2D)g; on.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); on.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC); on.drawImage(img, 0, 0, getWidth(), getHeight(), null); } </code></pre> <p>Addendum secundum: It looks like the <code>JPanel</code> UI delegate is not cooperating. One workaround is to extend <code>JComponent</code> so that you can control <a href="http://java.sun.com/products/jfc/tsc/articles/painting/index.html#props" rel="nofollow noreferrer">opacity</a>. It's only slightly more work to manage the <code>backgroundColor</code>. <code>NavBox</code> and <code>JScrollNavigator</code> are also candidates for a similar treatment.</p> <p><img src="https://i.stack.imgur.com/k5oiz.png" alt="enter image description here"></p> <pre><code>jsp.setViewportView(new JComponent() { { setBackground(Color.red); setBorder(BorderFactory.createLineBorder(Color.BLACK, 16)); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(getBackground()); g.fillRect(0, 0, getWidth(), getHeight()); } @Override public Dimension getPreferredSize() { return new Dimension(300, 300); } }); </code></pre>
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    1. COThanks - TBH I made those changes to JScrollNavigator already when I imported the code. I've noticed the corruption problem only occurs if I embed the JScrollNavigator as a sub-panel of the app frame; If I have the navigator as a separate JDialog it seems to work ok. I'll keep digging.
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    2. CO@Adamski: this [answer](http://stackoverflow.com/a/11745544/230513) reminded me about resampling artifact, mentioned in an article cited [here](http://stackoverflow.com/a/6916719/230513).
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    3. COThanks for the tips on resizing. See my second edit for an example of how to reproduce the corruption problem 100% of the time. It appears to be related to using a JPanel as the viewport view rather than e.g. a JTextArea, etc.
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