On Mon, Apr 30, 2012 at 06:11:02PM +0100, Jason Teagle wrote:

> How does what you expect ADD to do differ from a combination such
> as, say, SRC_OVER (in the images shown at
> http://softwyer.wordpress.com/2012/01/21/1009/, 'SrcOver' looks like
> we're seeing the yellow circle through the grey square as it it were
> tinted glass, which was my understanding of what you wanted - how is
> ADD different)?

It would appear that ADD (Saturate(S+D)) and SRC_OVER
([Sa + (1 - Sa)*Da,Rc=Sc+(1-Sa)*Dc]) are, in fact, identical (for my
purposes, anyways), despite the differences in the math.  I must have
missed this one before (that happens...cancer #1 blah blah blah).  Why
they use different math, I don't know (or care).  But it works.  No
exclusion like the modes I tried (though I thought for sure I'd tried
SRC_OVER ... guess not).

And with that, I'm heading back to the code...I'm happy to be finished
wasting time on this bit.  :-)

Thanks,
   --jim

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