Re: Alphablending

< http://www.szmyggenpv.com/downloads/LeafONBk.Zip >

it is much closer then your is to mine, eh?

Btw. it still doesn't alpha *blend*, it seems to be doing somekind of
trivial color keying from looking at the rendered results. I don't see
the alpha component used for blending weight at all as would be
appropriate in this situation.

If there is data: RGBA, RGB is the color and A is alpha component. It
can be used for a lot of interesting purposes, but when blending with
source factor set to "src alpha" and destination factor is set to "dest
inverse alpha" it means the blending equation is like this:

result = color1 * alpha1 + color2 * (1.0 - alpha1);

This case happens to be equivalent to:

result = interpolate(color1,color2,alpha1);

This will produce a "smooth" edges which are blended to background
gradually (the alpha component tells the strength of the color at each
sample).

Conclusion: you appear to be doing color keying, or alpha compare.
Since you colored the "background" blue it could be just simple color
keying. All the same very interesting stuff.

.

Relevant Pages

  • Re: Alphablending
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