Blackmagic Forum

Hello,

i know this is an old discussion from don't know when....
BUT, i got the same problem in Resolve 12, 14 and now 15.2. It's about playback performance issues with Display LUTs.

I tried all kinds of different configurations and narrowed it down to this:
When i use a LUT on the "3D Video Monitor" it works when Color Viewer AND Scopes use "Use Video Monitor Selection". When i choose "No LUT selected" for Color Viewer and/or Scopes the playback goes down to 11fps even without grades.

When i turn on "Hide UI overlays" it works again but also the Viewer AND the Scopes display a different image then. I guess it's the image with the Monitor LUT applied. This is creating a wrong image!
I use the Monitor LUT for the display calibration LUT and want the Color Viewer and especially the Scopes UNTOUCHED!

I had this problem for some time and never really worked through all the settings to actually find out the cause. I have one machine where i need the Display LUT because i use a non hardware calibration screen here... The other machine doesn't have the issue because i use a hardware LUT...
That's why i never really understood whre the problem came from until i tried all combinations...

So again:

Monitor: NO LUT ,Color Viewer/Scopes:Use Video Monitor Selection = OK
Monitor: LUT ,Color Viewer/Scopes:Use Video Monitor Selection = OK
Monitor: NO LUT ,Color Viewer/Scopes:NO LUT = BAD
Monitor: LUT ,Color Viewer/Scopes:NO LUT = BAD
Monitor: LUT ,Color Viewer/Scopes:NO LUT, Hide UI Overlays = OK, but wrong Color Viewer/Scopes


So it is mainly dependend on "Use Video Monitor Selection"... or the fact that whenever you use a DIFFERENT LUT setting on Monitor and ColorViewer/Scopes the playback framerate drops.

Could you please try to replicate this?
Thank You!

Monitor: NO LUT ,Color Viewer/Scopes:NO LUT = BAD

So, if you have no lut at all it is bad?

Yes...
In any case if it is not "Use Video Monitor Selection" it is bad...

Bump!

Can Someone try this?
Anyone?

Bye!

no issues on five machines, one near identical to your z620 (mine has dual10c's) two z820's, a z800 and a z420 with a k2200, so very close to marginal for playback already...

on all machines selecting any combination of luts makes no diffrence to playback

Hi Dermot,

thank you very much for trying this.
I did another test with the updated Version 15.2.1 and now it seems to work here too....
Strange thing.

Regards!