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)?
I tried lots of modes, including SRC_OVER. Imagine the following two
filters: the first is a solid color blue filter; the second is a fog
filter (graduated, upwards from the bottom)[1]. Every other method I
tried did some combination of showing only one filter or the other
where they overlapped, or where they did NOT overlap. That is *NOT*
correct. ADD shows both, where they overlap and where they don't.
Later,
--jim
[1] a combination useful for turning a bright, sunny day into a foggy
moonlit night, from which you can get really creative. :-)
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