"Motion Deblur" makes hair look strange

[michele.meschke]

I am noticing that “Motion Deblur” makes hair look strange…
It really looks better without “Motion Deblur”
Tested with Version 3.5.0 & 3.5.2.2.a

With “Motion Deblur”:

Without “Motion Deblur”:

logsForSupport.zip (3.0 MB)

[Imo]

To a certain degree motion deblur does a great improvement, but beyond that it gets worse and worse.

[michele.meschke]

Disabling “Motion Deblur” is not a solution…images loosing a lot of sharpness and overall image quality…“Motion Deblur” helps Iris2 to do it´s job better.

But this thing with the hair should be fixed…

[Imo]

not only with the hair. motion deblur messes up other things too

[Akila]

Motion deblur also removes details to some extent

[michele.meschke]

Is it possible that disabling “Motion Deblur” also disables “Iris2” ?!

I cannot see that “Motion Deblur” is removing details…it´s adding details due to reverting unsharpness in non rapid moving contend.

With Motion Deblur

Without Motion Deblur

There´s no big movement here so “Motion Deblur” shouldn´t have any positive results.
But disabling “Motion Deblur” degrades visual quality a lot.

[Akila]

Try playing with those parameters instead of using Motion deblur
they introduce much less artifacts

start with deblur 60 and sharpening 20 (or 30 deblur and 30 sharpening) . and play around with the values as you test

[michele.meschke]

Deblur 90-100 is very nice…but adding “Motion Deblur” is giving even more…
As i have already sharpen on 16…changing it to 20/30 doesn´t change a thing.

I always used Anti-Alias instead of Deblur there… i will stay now on Deblur 100

[bruce.duffey]

I’m seeing the same problem. Was using Motion Deblur with Iris in 3.4 with (to me) great results, but 3.5 I also get this strange issue on hair that wasn’t there before.

[ForSerious]

It can depend on the movie. I doubt that the exact same settings on the exact same movie will give different results between 3.4 and 3.5.

[bruce.duffey]

Same movie - no problem on 3.4 but problem appears in 3.5

[ForSerious]

3.5 introduced Iris version 2 and “Adds change moving “Enable Previous Model Versions” preference to advanced section of settings.”
Just making sure you’re not talking about differences between Iris v1 and v2.

Oh course there have been times in the past where models get messed up. Theia was ignoring most of the inputs of quite a few versions. Either way, making a bug report with all the details is the way to get attention.

[bruce.duffey]

It’s happening on both V1 and V2 of Iris.

I was using V1 on some VHS captures and getting great results. When V2 was released I thought I’d try that to see if was any better. That’s when I first noticed the issues on hair.

I went back to V1 thinking it was V2 causing it, but the issue remained. After trying various things I realized it was the motion deblur causing it.

I was redoing the same clips I did with V1 on 3.4 and the issues wasn’t there.

[bruce.duffey]

I should add I’ve not tried on other models…I’ll try that later today