Strange gamma shift on Dragon 5k clip in Resolve, any ideas?

[Mark K.]

Hi Guys,

I'm polishing off the grade on a short film shot in 5k on Epic Dragon, and am running into a bizarre gamma clipping issue with a single clip. Basically, with all of the same clip settings, raw settings and grading nodes applied, this one clip will not allow any element of the frame to rise above about 55 IRE on the waveform.

Here's how the rest of the scene looks:

And here's how this one clip is coming up:

If I try to bump up the levels via a contrast curve, we see the hard clipping at 55 IRE:

Does anyone have any ideas what might be causing this?

I had the problem come up initially in the previous version of v11 of Resolve, and I've moved to the Resolve v12 beta to see if that would help, but the problem persists in v12 too.

Any ideas?

Cheers,

Mark

 

[Juan Melara]

Any chance you could post an R3D still? I'll give it a shot here.

 

[Marc Wielage]

I suspect you have a highlight clip mode accidentally engaged. Create a new version, reset the entire correction (blow away all nodes to ground zero), and redo the camera raw clip settings from scratch. Use the Offset control to balance RGB, then use curves and/or primaries to taste. It can work unless something is major/big-time screwed up.

 

[Matt Ryan]

Sounds like you have the levels set from 0-55 instead of 0-100 maybe?

 

[Mark K.]

Eureka! Thanks guys, I figured it out through the magical power of clicking every possible icon/button possible. It was the 'Mix/Unmix' icon at the bottom left of the preview screen. No idea what it's doing exactly. But for now, the crisis is averted.

Cheers