Need to create simple image as byte stream...

I am looking for a simple and efficient mechanism (supported in Java 1.4.x and later) that would allow me to create a simple raster image byte stream (in .png, .gif or .jpeg encoding) given an RGB + Alpha value (Paint?) and x and y dimensions in pixels.
I know it sounds unbelievably trivial, but I haven't played with the image stuff in Java in a long time and I am looking for an easy (read "handed to me on a silver platter") solution.
TIA,
Chuck

I guess I should have looked for myself, but it being Friday and I being lazy I didn't want to bother...
The answer to this question is best rendered in the Java Almanac: http://javaalmanac.com/egs/javax.imageio/Graphic2File.html

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