By supporting transparency you catch an interesting problem. Suppose you draw an image like a PNG file that has an alpha channel incorporated. You have trasparent pixels and half transparent pixels.
I suppose computing the tightest box would consider half trasparent pixels as opaque and put them inside the box instead perfectly transparent pixels would be outside the box, right. Anyway what method would make this calculation, can you give me any insight ? And just another question what if you don't want to get rid of those completely transparent pixels, suppose you use them for centering pursposes. Anyway I reply to the to question about which BufferedImage. Should it be a BufferedImage.TYPE_INT_RGB or TYPE_INT_ARGB ? I suppose the latest. But I had strange behaviours with the last type... Example I was working with photoshop layers and Blending Modes I used an implementation of Composite for Screen Blending mode from a previous version of SwingX. I got an Image from an ImageIcon from a JLabel. And using composites I had uncorrect behaviour from using it directly. I lost all the trasparency from the original PNG file used in the JLabel, when applying the composite. The same has happened when I tried to create a bufferedImage TYPE_INT_ARGB and draw the image over it and then use this for the composite. Instead redrawing the original image on a bufferedImage TYPE_INT_RGB and then using this for the composite works perfectly. Here's the sample code: /// CODE SNIPPET START Graphics2D g2D = (Graphics2D) g; Composite myComposite = BlendComposite.Screen; Composite originalComposite = g2D.getComposite(); // Using this Image directly would give loss of all transparency and uncorrect result on Composite. Image glowImage = group.getArrowGlowImageIcon().getImage(); // Procedure to make Images with alpha work with Blending Composites // Declaring the image type as BufferedImage.TYPE_INT_ARGB would give same results as not using any buffered Image at all BufferedImage bufferedGlowImage = new BufferedImage(glowImage.getWidth(null),glowImage.getHeight(null),BufferedImage.TYPE_INT_RGB); Graphics2D imgG2D = bufferedGlowImage.createGraphics(); imgG2D.drawImage(glowImage, 0, 0, null); imgG2D.dispose(); g2D.setComposite(myComposite); g2D.drawImage(bufferedGlowImage, x, y, null); // Restore of the old Composite to paint other stuff correctly g2D.setComposite(originalComposite); /// CODE SNIPPET END As a proof of that problem I tracked the object and the image returned from the imageIcon contains a BufferedImage imageType == 2 in his imagerep. [Message sent by forum member 'estades' (estades)] http://forums.java.net/jive/thread.jspa?messageID=216564 =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
