Debanding help !

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John Spirou

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Debanding help !

PostFri Dec 25, 2020 4:45 pm

I make (coloring) a documentary movie and i have a lot of footage that has banding from wrong shutter speed , i suppose.
I upload a small portion to see it.

I tried all known methods, plugins etc but i cant remove it...can you help me please ?
I have studio version, i tied deflicker / deband and a plugin in after effects , deflicker v2.

Nothing works...is there any solution ?

https://www.dropbox.com/s/cmo6lkzt1yrv6 ... 4.mov?dl=0
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Hendrik Proosa

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Re: Debanding help !

PostFri Dec 25, 2020 8:51 pm

Looks like bands are in same position all the time, I’d try grading them out. Create soft masks for band areas and increase exposure. Fixed pattern is probably the reason why all deflickers etc fail.
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John Spirou

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Re: Debanding help !

PostFri Dec 25, 2020 9:05 pm

Ok.... I will try it.



EDIT... i just tried but i realized that bars are moving, they are not static.
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Igor Riđanović

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Re: Debanding help !

PostFri Dec 25, 2020 10:20 pm

Try adding some animated noise. Although the deband filter is pretty good. If that fails adding noise may not help much.
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John Spirou

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Re: Debanding help !

PostFri Dec 25, 2020 11:27 pm

i tried everything... not working.

If someone tries something with success , i would like to know .
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Jim Simon

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Re: Debanding help !

PostMon Dec 28, 2020 2:48 pm

There is a DeBand effect.

Never tried it myself.
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John Spirou

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Re: Debanding help !

PostMon Dec 28, 2020 2:48 pm

i tried it, it doesnt work in this case.
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Jim Simon

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Re: Debanding help !

PostMon Dec 28, 2020 2:54 pm

Bummer.

You may find yourself running into an often overlooked reality - not everything can be fixed in post. Sometimes, you have to shoot it right.
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waltervolpatto

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Re: Debanding help !

PostMon Dec 28, 2020 4:54 pm

If a banding look like slow light flicker, use the deflicker tool in advance mode.

Post a little clip of the issue so we can help better.
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Andrew Kolakowski

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Re: Debanding help !

PostMon Dec 28, 2020 4:58 pm

It's not banding and not a single de-band filter will fix it.
It's some scanline problem. Combination of shutter speed vs lighting etc.
Not easy to fix.
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John Spirou

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Re: Debanding help !

PostMon Dec 28, 2020 4:59 pm

i putted one link in first post... you can try and see.
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waltervolpatto

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Re: Debanding help !

PostMon Dec 28, 2020 5:02 pm

John Spirou wrote:i putted one link in first post... you can try and see.



My bad, I missed it...

That is really difficult to to fix... especially if those bands move very slowly...
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John Spirou

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Re: Debanding help !

PostMon Dec 28, 2020 5:10 pm

yes, i know....
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George Deierling

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Re: Debanding help !

PostTue Dec 29, 2020 12:12 am

An idea (havn't looked at your clip):
The Fusion tracker gives you more flexibility for this type of problem.
Got to Fusion tab - create an extreme contrast that makes the bands visible as much as possible.
then track a band on a portion where its most visible with planar tracker, just using x and y curves.
With curve editor zero out the x graph, then manually clean up and extrapolate the y graph - assuming that the travel speed is constant. and fine tune it to get the best possible match.
Then apply the y movement to a mask that separates out the bands and then lets you correct out the difference.
A fun challenge - or not.

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