Blackmagic Forum

I am animation a couple of .psd layers in Resolve's Fusion page. The Animation starts with some layers animating in on a transparent background (a sky blue background node with its Alpha on 0) At some point the background is supposed to fade in (Alpha animated to 1) completely obscuring whatever lies underneath the fusion clip.

The animation basically works like I intend to, but I get strange fringing around layers, as long as this background node is not faded in completely. I know the color fringes stem from this background node, because when I change its color the fringe color also changes. It feels a bit like a premultiplied Alpha issue, but I don't know how to get rid of this.

If anyone could pont me in the right direction, it would be much appreciated.

here is a lint to my node-tree and to a render of the problem:

https://www.dropbox.com/scl/fi/qrtn7y6u5hsph7l6eru1r/Screenshot-2025-06-02-at-21.53.27.png?rlkey=6l3a85qfzxwsdoirejt2bh7ge&st=l4hip224&dl=0

https://www.dropbox.com/scl/fi/lf18jalzi9n89oo7bng4x/Timeline-11.mp4?rlkey=yvi1yfwfmgt1apaljn4n7bifs&st=lfudqno3&dl=0

Possible issue with premultiplication. Usually an easy fix if you know how to.

Understanding Premultiply, Unpremultiply and Alpha Divide ( Fusion 8 )



Transparency and Color - Alpha Multiplication in Resolve/Fusion



Straight vs. Premultiplied Alpha | 3D Graphics Overview



CD / The Horrors of the Alpha Channel



 What is Alpha Channel in Compositing

Thanks for the link-collection. I was hoping for a more acute solution. So I built the whole thing in After Effects an imported it as a ProRes4444 with Alpha. But I'll check out the links when I am not on a deadline.

Florian Gintenreiter wrote:Thanks for the link-collection. I was hoping for a more acute solution. So I built the whole thing in After Effects an imported it as a ProRes4444 with Alpha. But I'll check out the links when I am not on a deadline.

There should be no need for that. So yeah, maybe next time. Nice little animation by the way. I like it.