I want to blend to images together with jit.op the same way as its possible to do with jit.alphablend.

just wounder. which mathematical expression shall I use to get equal result?

but doesnt seems to be the ones. output a different image than jit.alphablend

jit-op

You can't do it with a single jit.op object. (That's why there's jit.alphablend.)

http://en.wikipedia.org/wiki/Alpha_compositing

You can't do it with a single jit.op object. (That's why there's jit.alphablend.)http://en.wikipedia.org/wiki/Alpha_compositing


See also Luke Woodbury's example patch in this thread: 

https://cycling74.com/forums/laying-one-jit-matrix-with-an-alpha-channel-over-another-should-i-use-jit-op

See also Luke Woodbury's example patch in this thread: https://cycling74.com/forums/laying-one-jit-matrix-with-an-alpha-channel-over-another-should-i-use-jit-op
