Artifact issue using MBR color corrector 3 in Premiere

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goldtoes68

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Artifact issue using MBR color corrector 3 in Premiere

PostTue Jun 28, 2022 5:20 pm

I'm getting an artificating issue in premiere both in the preview and when I export it. The artifacts look like they're a grid pattern that's fanning out.

I'm recording it in Raw Ultra HD Constant quality q0 on the black magic 4K pocket cinema

What is this issue and how do I fix it?
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mbr edited footage.jpg
Artificating issue
mbr edited footage.jpg (115.21 KiB) Viewed 1376 times
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Uli Plank

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Re: Artifact issue using MBR color corrector 3 in Premiere

PostThu Jun 30, 2022 9:09 am

Does that background have any regular, fine pattern?

Or were there any strong electromagnetic sources nearby while recording?
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goldtoes68

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Re: Artifact issue using MBR color corrector 3 in Premiere

PostThu Jun 30, 2022 5:02 pm

I figured it out. My camera was too in focus and was picking up lines from the projected image that weren't there.
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Uli Plank

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Re: Artifact issue using MBR color corrector 3 in Premiere

PostThu Jun 30, 2022 6:29 pm

Also called 'false detail' from aliasing.
The software may be free, but the hardware needed for smooth performance is not.

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goldtoes68

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Re: Artifact issue using MBR color corrector 3 in Premiere

PostMon Jul 18, 2022 4:28 pm

Having a name for it is super helpful. Thank you very much!

Is there a way to fix this without putting the camera out of focus?
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Uli Plank

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Re: Artifact issue using MBR color corrector 3 in Premiere

PostMon Jul 18, 2022 8:36 pm

You may want to try a softening filter.
The software may be free, but the hardware needed for smooth performance is not.

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Mike Ambrose

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Re: Artifact issue using MBR color corrector 3 in Premiere

PostTue Jul 19, 2022 3:26 am

What were you filming, an image projected onto a screen?

This looks like the moire effect: https://en.m.wikipedia.org/wiki/Moir%C3%A9_pattern

Your best bet is to ensure that your camera's sensor's pixels are picking up multiple projector pixels (it does reduce your effective resolution though) or that multiple camera pixels pick up a single projector pixels (you may not have enough resolution to do this).

You can see this kind of thing in the wild if you look back at 2010-era live concerts with video walls. As the camera zooms in on the singer there a spot where the moire pattern is really bad and then it goes away as the ratio of camera pixels to LED wall pixels changes.

Edit: Found a good example here:
(Start at 45:51. The embed on this forum breaks the timestamp in the link.) Make sure you watch fullscreen and keep an eye on the LED wall as the camera zooms.
Last edited by Mike Ambrose on Tue Jul 19, 2022 7:03 pm, edited 2 times in total.
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Uli Plank

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Re: Artifact issue using MBR color corrector 3 in Premiere

PostTue Jul 19, 2022 7:57 am

Some projectors (like my Panasonic) have a pixel smoothing filter built in.
Makes them difficult to focus to the screen, but might help in your case.
The software may be free, but the hardware needed for smooth performance is not.

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