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Question regarding older JDK and Transparent images

Steven Hatfield

Joined: Jan 25, 2010
Posts: 6
Hello! This question is for the long timers of Java. I am a newbie to Java (but an old hat programmer), and have a weird issue that I need some help with.

I am working with a Java program that was developed from 1999 to 2007, and then purchased by the company that I work for. The team that I am working with is responsible for creating the next version of this program, which contains several enhancements and fixes to existing code.

In the program, images are displayed over the top of other images at several places in the UI, so it is a 'foreground' and 'background' image setup. The thing that is weird is that there is a process of converting the 'foreground' images into a different image format, removing transparent pixels from the top and left of the image, leaving only pixels that can be seen. The conversion process outputs a csv file that contains the original location of the non transparent pixels, so that the image can be displayed in the proper location. This is a pretty intensive process, given that it does this to over 5,000 images!

The problem is that while it works fine on Windows XP, it is broken on Windows 7. The images that are converted on Win7 come out odd looking, with colors that don't match the original images, etc.

The good thing is that my teammates and I have created an editor that allows us to create composite images using transparency and have had no problems at all. Given this info, we're ready to eliminate this conversion process with standard PNG files, and rewrite the portions of the program that use the converted images. In order to do this, I need to be able to speak to management with authority about why this conversion process exists at all...

So the question I have is -- did "Java of old" have problems displaying images with transparency over the top of other images?

Thanks in advance for any help.
Steven Hatfield

Joined: Jan 25, 2010
Posts: 6
I was able to track down one of the original developers, and it turns out that the conversion process was created to reduce the size of the memory footprint of the application.
Rob Spoor

Joined: Oct 27, 2005
Posts: 20271

Next time UseOneThreadPerQuestion. This is a full duplicate of this thread.

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