PhiLho and corgrath provide Java code examples illustrating conversion of a background color to a transparent background for an image in the StackOverflow thread How to make a color transparent in ...

If you can't overlay transparent jpanel then you should minimize the re-drawing to the areas affected. (Depending on how stacked jpanels work it may still be faster for you to do it this way ...

Java Community Process now open, transparent, and agile (or not) how-to May 29, 2009 2 mins Open Source ...