How to save Buffered Image with variable transparency in a file.

Hi,
I need to save BufferedImage (type ARGB) in a file.
Transparency in this image is a function of position. Who knows, what would be the best suggestion for type of file to store this image (probably not JPEG) and which package would be appropriate. A sample of code would be higly desirable. Please help, thank you in advance.

Your can use the ImageIO-API if your software runs under JVM1.4 or you must use the JAI (Advanced Imaging API) ...

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