I was wondering if anyone could help to clarify an issue I am having
trying to dynamically modify the alpha channel on a bitmap to build a
gradient alpha.

It seems that after dropping the alpha on the bitmap data, the color
values become modified if I later increase the alpha value.  I am
figuring that this is some result of alpha pre-multiplying or
something similar.

My question is this: is there any way to be able to repeatedly rebuild
a gradient alpha on an image with out keeping a known good copy of the
image to base it on (I am trying to avoid large amounts of memory
consumption).  I have been unable to find anything with masks,
filters, or bitmap data that works.  I would greatly appreciate any
information or ideas.

Dan Shryock
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