Blackmagic Forum

So if you take two "light background" media (easier to see the issue with light colors), and then you rotate the one being "above", the edge will appear jagged :

Example:

It's possible to work around the issue, if you crop a bit of that edge, that will fix it. Also using a fusion composition for the top clip fixes it ( even just an "empty" one with just media in -> media out will fix it ).

So not the end of the world, but still a sign that something isn't working quite right and should probably be looked at.

Under Project Settings>Image Scaling, what is your anti-aliasing set to?

Does it also export like that?

Scaling was set to "Sharper". And yes, it's present in the render.

With scaling set to "sharper" or "smoother" the output is like this :


With scaling set to "bicubic" or "bilinear" the output is like this : (no "black" but still stair case)


If I either :
- In any scaling mode, I crop 1 pixel on the top.
- Or in "sharper" or "smoother", I add a fusion comp on the top clip (empty one, just go to fusion tab, move the node, go back to edit tab). For the "bicubic" / "bilinear" mode, adding the fusion comp doesn't change the result, still white staircase as above.

Then the result is like this : (which is what I would expect)

Not Scaling, Anti-Aliasing?

"Anti-Alias-Edge" ?

It's on "Auto". Setting it to "On" doesn't change anything.
Setting it to "Off" changes slightly, but still wrong / with black border.

(Done with "Sharper" resize filter)

Got it.

I've found that the nVidia settings make a huge difference on the performance of anti-aliasing in Resolve. I tried tons of combinations (each having to re-start Resolve between changes!) and below was the best I found. It gave perfect quality on-screen and mostly acceptable on deliver. Note that project settings image scaling resize filter must be changed to bicubic or bilinear for this to work.

nVidia, app specific for Resolve-- FXAA: ON

https://prnt.sc/12hsc8l

Also, as you can see, with these particular settings in the nVidia control panel, the anti-alias setting in Resolve didn't seem to matter anymore.

Btw this is on my Quadro M5000M. Did not test on any desktop system yet.

This seems to be fixed in 7.2
I played around with my test project and the results looked good no matter what I tried.