Rune wrote:
[Snip]
> So, what do you think of this solution? I'd like to hear your opinions.
> 
> Rune

Why not use "associated alpha" approach instead, which is used in
RenderMan (R) renderers (shaders actually): it premultiplies opacity
with color and outputs "dimmed" colors. 
Here is link, which describes image compositing and probably gives
answers to Your questions, no need to reinvent the wheel:
ftp://ftp.alvyray.com/Acrobat/4_Comp.pdf

Other papers could be found in Alvy Ray Smith's site at:
http://www.alvyray.com/
select Memos and then Microsoft.

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