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copied!<p>The problem (at least with png to jpg conversion) is that the color scheme isn't the same, because jpg doesn't support transparency. </p> <p>What we've done successfully is something along these lines (this is pulled from various bits of code - so please forgive the crudeness of the formatting):</p> <pre><code>File file = new File("indexed_test.gif"); BufferedImage image = ImageIO.read(file); int width = image.getWidth(); int height = image.getHeight(); BufferedImage jpgImage; //you can probably do this without the headless check if you just use the first block if (GraphicsEnvironment.isHeadless()) { if (image.getType() == BufferedImage.TYPE_CUSTOM) { //coerce it to TYPE_INT_ARGB and cross fingers -- PNGs give a TYPE_CUSTOM and that doesn't work with //trying to create a new BufferedImage jpgImage = new BufferedImage(width,height,BufferedImage.TYPE_INT_ARGB); } else { jpgImage = new BufferedImage(width, height, image.getType()); } } else { jgpImage = GraphicsEnvironment.getLocalGraphicsEnvironment(). getDefaultScreenDevice().getDefaultConfiguration(). createCompatibleImage(width, height, image.getTransparency()); } //copy the original to the new image Graphics2D g2 = null; try { g2 = jpg.createGraphics(); g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC); g2.drawImage(image, 0, 0, width, height, null); } finally { if (g2 != null) { g2.dispose(); } } File f = new File("indexed_test.jpg"); ImageIO.write(jpgImage, "jpg", f); </code></pre> <p>This works for png to jpg and gif to jpg. And you will have a white background where the transparent bits were. You can change this by having g2 fill the image with another color before the drawImage call. </p>

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