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Black spots while playing were image is blown out

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Timothy Ryan
Black spots while playing were image is blown out
on Oct 25, 2011 at 5:44:49 pm

Had something funny happen to me overnight. I opened FCP and had black spots appear where the sky is blown out after doing color correction last night. This wasn't the case last night, only when I awoke this morning. It only appears while playing in the timeline, not in the viewer. And it still shows up when I export a quicktime.

-Tim




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David Roth Weiss
Re: Black spots while playing were image is blown out
on Oct 25, 2011 at 5:54:56 pm

That certainly appears to be related to the alpha channel. Did you attempt to key out a portion of the sky? If so, you're going to have to fully explain what you used and exactly how you used it.

David Roth Weiss
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Timothy Ryan
Re: Black spots while playing were image is blown out
on Oct 25, 2011 at 6:11:38 pm

No, didn't try to key anything. I performed color correction last night (3-way and Magic Bullet Looks) rendered it fine and exported. When I opened this morning it started happening. Weird thing is, on some affected shots, if I click the highlights down 1-click in the 3-way color corrector and re-render it fixes it. So, could it be corrupt render files? Wondering if I delete all render files and start fresh if it would work. But, that's a several hour process so trying other fixes first.

Thanks,
Tim


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Rafael Amador
Re: Black spots while playing were image is blown out
on Oct 25, 2011 at 7:05:29 pm

That's a MB issue.
I've been having that with certain MB presets.
Are you working in Prores 1080?
rafael

http://www.nagavideo.com


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Timothy Ryan
Re: Black spots while playing were image is blown out
on Oct 25, 2011 at 7:12:00 pm

Yup ProRes 422, in 1080. I'm trying to render in 8-bit YUV (instead of 10-bit). Will let you know if that works.

Did you ever find a work-around?


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Timothy Ryan
Re: Black spots while playing were image is blown out
on Oct 25, 2011 at 9:07:03 pm

It appears to fix most of the problems if you render in 8-bit YUV. Still had one small glitch that was tucked in the top corner.

-Tim


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Rafael Amador
Re: Black spots while playing were image is blown out
on Oct 26, 2011 at 2:06:54 am

Hi Timothy,
I think is all about GPU.
What I do, instead of rendering in 8b, is working in 720.
rafael

http://www.nagavideo.com


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Eric Johnson
Re: Black spots while playing were image is blown out
on Oct 29, 2011 at 1:27:50 am

It looks like clipping to me.... which in FCP you generally will not see until you render.... Check you scopes and see if anything is above 110. You may also increase your head room by turning "Super-White" on.


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