How do I make weighed average (using alhpa channel as weight) of pictures?

Question

I have multiple similar pictures I want to make aveage of, but not uniformatically. Each zone in pictures should have separate weight, and the weight is encoded in alhpa channel (fully transparent - zero weight, fully opaque - unit weight).

How to do it from command line?

score 0 · Accepted Answer · answered May 26 '14 at 22:23

0

Probably it's something like this:

convert input1.png input2.png -channel RGB \
    -fx '(u[0]*u[0].a + u[1]*u[1].a) / (u[0].a + u[1].a)' \
    output.png

answered May 26 '14 at 22:23

Vi.

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How do I make weighed average (using alhpa channel as weight) of pictures?

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