FS7: Banding when adding LUT to fs7/ cine ei/ slog 3.

C

corycross

Well-known member
Hey Everyone,

I have been filming with the FS7 for about 9 months now and have followed the rules when shooting in Cine Ei, slog 3, xavc i and have also followed the rules of exposing correctly with highlight at 61% on the WVM. Whenever I take the footage into premiere pro cc, it looks like obvious **** (noise and flat image wise). Whenever I add the LUT to the image, the colors are beautiful, image looks great however I do notice terrible banding in some clips. Can anyone enlightenment me on this subject, why it is doing that and any help in getting rid of that in my next projects I shoot or if possible get rid of it now with the footage I shot.

I appreciate everyones time in looking through this. Thanks

banding1.jpgbanding2.jpgnobandingnolut.jpg
 
Believe a number of users were having similar problems when applying LUTs within Premiere Pro CC. Test the de-log in another program such as Resolve, Catalyst, etc.
 
Thanks everyone on their feedback. Its render settings are 10 bit. I downloaded Catalyst and can't seem to get the LUTs into it. So been searching on google, if anyone has any idea how to do this it would be greatly appreciated.
 
Do you mean banding as in posterisation caused by limited colour fidelity e.g. visible bands in skies or do you mean compression artefacts?

There are visible compression artefacts to the left of the gent in the light area but you won't have much joy getting rid of these artefacts without resorting to an ProRes external recorder. XAVC targets large areas of low detail to crunch like crazy, I've noticed it in skies.

There's a ProRes recorder in my future.
 
I tend to expose for 1250 ISO whenever possible. 2000 looks great for situations where you've got a window or other area where you'd normally lose highlight detail, but without anything bright, you're really just throwing away shadow detail for nothing.
 
I'd guessed it might be them. There was an issue a while back with Impulz luts for SLog introducing banding. I believe they fixed it.
 
Just ran into a similar issue, although through Avid & LCD709a LUT.
18 test renders later, I found out the only thing that worked for me was exporting same as source.

A guy I know who edits in premiere said his workflow is premiere -> speedgrade -> after effects and renders from there... otherwise he'd get banding trying to keep it 10 bit (premiere was going to 8bit or something for him).
 
corycross said:
Impulz LUTs.
Click to expand...

I use the Impulz LUTs all the time, the key to avoiding banding with them, is to have your first colour correction node perform a slight chroma de-noise on the image. I generally go with 18-20% (this is mentioned in the manual for the LUTs).

This solves the banding issues with Impulz 95% of the time. And when it doesn't, I either overlay some filmgrain before applying the Impulz LUT (I add a slight grain to most of the images I grade anyway) or switch to Filmconvert for the colour transform on that particular scene.
 
To avoid any problems with LUTs, simply don't use them.

As I'm working as a colorist lately, I try to avoid LUTs whenever possible.
Most of the time it's better to rebuild the look with LGG and curves within some minutes.
 
I sometimes load a LUT (impulz or other) into LUTcalc and transfer just the gamut and keep the log gamma. Or I choose another gamma like LC709/A to get a more flat startingpoint.
 
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