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OUTPUT LUT - Banding Issues During Playback

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Craig Harris
OUTPUT LUT - Banding Issues During Playback
on Mar 18, 2012 at 2:52:03 am

Having a serious issue.
When using an output LUT during playback, there is intermittent banding and flashing on the image.

Project Specs:
- Alexa ProRes
- 23.98
- LogC to Rec 709 LUT (Output LUT)
- CDL grade on image

System Specs:
- iMac 27" & MacBook Pro

Version:
- 8.2


Any ideas would be very helpful.

kindly,
Craig


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Margus Voll
Re: OUTPUT LUT - Banding Issues During Playback
on Mar 18, 2012 at 4:31:38 am

I'd say system is rather limited.

I hear some people have similar flashing situation with imac.

Is it better without lut ? and with some uncompressed media ?

--

Margus

http://iconstudios.eu


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Mike Most
Re: OUTPUT LUT - Banding Issues During Playback
on Mar 18, 2012 at 6:13:07 am

Are you talking about playback in the window in the GUI?


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Craig Harris
Re: OUTPUT LUT - Banding Issues During Playback
on Mar 18, 2012 at 4:56:18 pm

No. The banding occurs in the reference monitor fed by an ultra studio.


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Mikhail Puzyrev
Re: OUTPUT LUT - Banding Issues During Playback
on Mar 18, 2012 at 8:28:50 am

Why don't you try to watch it on iPad.


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Mikhail Puzyrev
Re: OUTPUT LUT - Banding Issues During Playback
on Mar 18, 2012 at 8:32:38 am

Seriously you shouldn't judge image using GUI screen. Only decklink video output on the 10 bit ( minimum) per channel video device-monitor-projector can be used to understand what kind of garbage do you have.


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Craig Harris
Re: OUTPUT LUT - Banding Issues During Playback
on Mar 18, 2012 at 4:56:11 pm

[Mikhail Puzyrev] "Seriously you shouldn't judge image using GUI screen."

I am not not judging by the GUI... seriously.

Running thunderbolt out to an Ultra Studio 3D.

The output LUT is required as it is the base LUT for entire series. Any primary grades being made are passed on as CDL to lab where they will use same LUT to produce dailies etc.

NOTE: There is no banding when using the LUT as display, input or on a node.


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Mike Most
Re: OUTPUT LUT - Banding Issues During Playback
on Mar 18, 2012 at 5:15:56 pm

This may sound a bit out of left field, but check the Filtering setting under Video Monitoring on the Config page. If it's on anything other than Basic, try changing it to Basic and see if the problem persists. What you describe has been known to happen with Bilinear filtering. It's a pretty obscure setting, and the issue is content dependent.


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Craig Harris
Re: OUTPUT LUT - Banding Issues During Playback
on Mar 18, 2012 at 5:30:53 pm

Thanks Mike.
I cycled through all the settings but the result is the same.

Something interesting though...
The footage plays back ok with output LUT applied UNTIL any of the lift / gamma / gain values are changed. As soon as one value is changed, the banding appears.

Again, this only happens when using the output LUT filed in the config page.


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Mike Most
Re: OUTPUT LUT - Banding Issues During Playback
on Mar 18, 2012 at 6:04:43 pm

Well, as a hack you might want to try creating a track node and attaching the output LUT to it to see if you still have the same problem.


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Margus Voll
Re: OUTPUT LUT - Banding Issues During Playback
on Mar 19, 2012 at 8:52:55 am

I wonder if you had the problem before and if it shows on other machines?

--

Margus

http://iconstudios.eu


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Craig Harris
Re: OUTPUT LUT - Banding Issues During Playback
on Mar 25, 2012 at 2:06:19 am

[Margus Voll] "I wonder if you had the problem before and if it shows on other machines?"

The issue is present on multiple machines.


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Craig Harris
Re: OUTPUT LUT - Banding Issues During Playback
on Mar 25, 2012 at 2:04:52 am

Hey Mike,
That's what I ended up doing and it's a sufficient workaround. It displays the image exactly as the output LUT mode does.

Thanks,
Craig


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