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POjava background transparent
 

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    <p>I have a gif image wich contains only a colored shape, and a transparent background</p> <p>I would like to replace the shape's color by the one I want (the color palet for this gif is only 2 colors : transparent and white in my case).</p> <p>I've created a filter wich correctly replace white with red (this is a test)</p> <p>However I'm encountering an issue with my method imageToBufferedImage, it removes the transparency and replace it with black (don't know why).</p> <p>So what I've done so far is this :</p> <pre><code>import java.awt.Color; import java.awt.Graphics2D; import java.awt.Image; import java.awt.Toolkit; import java.awt.image.BufferedImage; import java.awt.image.FilteredImageSource; import java.awt.image.ImageFilter; import java.awt.image.ImageProducer; import java.awt.image.RGBImageFilter; import java.io.File; import javax.imageio.ImageIO; public class TestPNG { public static void main(String[] args) throws Exception { File in = new File("bg.gif"); BufferedImage source = ImageIO.read(in); int color = source.getRGB(0, 0); Image image = makeColorTransparent(source, new Color(color), new Color(255, 0, 0)); BufferedImage transparent = imageToBufferedImage(image); File out = new File("bg2.gif"); ImageIO.write(transparent, "gif", out); } private static BufferedImage imageToBufferedImage(Image image) { BufferedImage bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_ARGB); Graphics2D g2 = bufferedImage.createGraphics(); //g2.setBackground(Color.blue); g2.clearRect(0, 0, 200, 40); g2.drawImage(image, 0, 0, null); g2.dispose(); return bufferedImage; } public static Image makeColorTransparent(BufferedImage im, final Color search, final Color replace) { ImageFilter filter = new RGBImageFilter() { public final int filterRGB(int x, int y, int rgb) { if (rgb == search.getRGB()) { return replace.getRGB(); } else { return rgb; } } }; ImageProducer ip = new FilteredImageSource(im.getSource(), filter); return Toolkit.getDefaultToolkit().createImage(ip); } } </code></pre>
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      1. USCarlos Valenzuela
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    1. COI need to specify that removing the filter still causes the same issue of black color instead of transparency So the issue come either from Toolkit.getDefaultToolkit().createImage(im.getSource()) or from the imageToBufferedImage method
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