It looked like this
here i use an image to change the alpha channel of a pure green image
and
For this I draw on a red image with color and alpha channel (the alpha channel value is mentioned in the image). The background are boxes in different color to show the effect.
There was no responce to the demo so I deleted it from my site.
If you are interested in, i can mail it to you (about 500k zipped)
To code or not to be...
GALACTIC X - A brief overview - http://www.angelfire.com/space2/galactix also my IDE: jaPROe - the Image Enhance plugin and some snippets and tools -