unmult vs. screen transfer mode

[John Dickinson]

Unmult and other plug-ins like Xmult and Walker Effects Premultipy create an alpha channel for layer they are applied to, Screen mode doesn’t.

[Barend Onneweer]

On a dark background you might not see much of a difference, but if you have an explosion or something similar you need to composite onto a bright background there’s a huge difference between unmultiplying and screening.

Without going into the math here: generally using Unmult gives the colors more ‘body’ and a less transparent look.

Bar3nd

Forum COWmunity leader for:
ADOBE AFTER EFFECTS
MAGIC BULLET SUITE
INDIE FILM & DOCUMENTARY

[Kenny Mims]

Thanks guys. I see it!