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Color Banding with Filmbox - Have tried Aces and DWG both #207

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sibtainmushtaq opened this issue Nov 21, 2024 · 20 comments
Open

Color Banding with Filmbox - Have tried Aces and DWG both #207

sibtainmushtaq opened this issue Nov 21, 2024 · 20 comments

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@sibtainmushtaq
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Hello having alot of color banding with filmbox please have a look

https://youtu.be/1Fw6xPLZoDc
@gregcotten
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Hi - this looks like you probably don't have color management set up in your Resolve project correctly. Please check the User Guide PDF in the help menu for more info, or if you are still having issues please email us at [email protected] with screenshots of: your color management settings in your project, any input colorspace settings you might have on the clip you're having trouble with, and of course your Filmbox settings. Also provide a source clip if you can so we can check on our end.

@sibtainmushtaq
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sibtainmushtaq commented Nov 21, 2024 via email •
edited by gregcotten
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@sibtainmushtaq
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sibtainmushtaq commented Nov 21, 2024 via email •
edited by gregcotten
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@andrewfinch
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andrewfinch commented Nov 22, 2024 •
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Hi it appears that your original footage (visible when you bypassed filmbox in the video) is clipped in the sky - so any grade operation that attempts to pull more color out of the sky like Filmbox does is going to make that clipping more apparent. This is also exacerbated by the fact that the footage is display-referred and has to go through an inaccurate transform to produce log-like image data.

Here is a demonstration with a screenshot of your original footage using just a curves and saturation adjustment (no filmbox):

Screenshot 2024-11-21 at 4 36 55 PM

You can try to roll off the highlights to make the transition from blue sky to clipped sky less apparent and then possibly key in a blue sky later if that is desired. Here is a LUT you can run in ACEScct before Filmbox that might help to roll off the highlights:

rolloff.cube.zip

@sibtainmushtaq
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sibtainmushtaq commented Nov 22, 2024 via email

@sibtainmushtaq
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here is a comparison video between both plugins and same settings

https://youtu.be/RiWXKBgTUGY

i hope there is an update to fix this issue.

thanks in advance

Sibtain Mushtaq
+255785413742

@gregcotten
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Is your source media truly sRGB? Please send us a source media clip that has this banding directly at [email protected] and we can take a look at it

@sibtainmushtaq
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sibtainmushtaq commented Nov 22, 2024 via email

@gregcotten
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I am not familiar with how Dehancer works so I can't really discuss A/B comparisons. Please send an example clip to us so we can reproduce it on our end at [email protected]

@sibtainmushtaq
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here you go https://drive.google.com/drive/folders/1BG8UVCNZFnGtKrtGo4_kGWQYwoQI0k0J?usp=sharing

@sibtainmushtaq
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sibtainmushtaq commented Nov 22, 2024 via email

@andrewfinch
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Hi after reviewing your footage it appears to be scene-referred HLG (Rec 2100 HLG) with Rec709 primaries rather than display-referred sRGB:
Screenshot 2024-11-22 at 10 47 07 AM

Setting the ACES IDT to sRGB as you have done in your video will produce unpredictable results. ACES does not have an IDT for this type of footage. The simplest setup is as follows:

Disable all color management, (use Rec709-A and ensure "Use Mac display color profiles for viewers" is enabled if grading on a Mac):
Screenshot 2024-11-22 at 11 02 12 AM

Use a Resolve Color Space Transform node to convert to one of the input spaces that Filmbox supports such as ACEScct.
Screenshot 2024-11-22 at 10 46 20 AM
Configure Filmbox Source to ACEScct:
Screenshot 2024-11-22 at 10 55 43 AM

The image seems to be fairly over exposed in camera, but this is the resulting image after reducing the exposure by 1.5 stops:
Screenshot 2024-11-22 at 10 57 16 AM

@sibtainmushtaq
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sibtainmushtaq commented Nov 22, 2024 via email

@sibtainmushtaq
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sibtainmushtaq commented Nov 22, 2024 •
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i tried above method , but not getting the look ! feels muddy

to Add im loosing all the dynamic range in the scene

@sibtainmushtaq
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i tested the highlight roll off cube you provided and seems to have solved my issue ! hope this option could be included in Filmbox for us in built to roll off

Hi it appears that your original footage (visible when you bypassed filmbox in the video) is clipped in the sky - so any grade operation that attempts to pull more color out of the sky like Filmbox does is going to make that clipping more apparent. This is also exacerbated by the fact that the footage is display-referred and has to go through an inaccurate transform to produce log-like image data.

Here is a demonstration with a screenshot of your original footage using just a curves and saturation adjustment (no filmbox):

Screenshot 2024-11-21 at 4 36 55 PM You can try to roll off the highlights to make the transition from blue sky to clipped sky less apparent and then possibly key in a blue sky later if that is desired. Here is a LUT you can run in ACEScct before Filmbox that might help to roll off the highlights:

rolloff.cube.zip

i tested the highlight roll off cube you provided and seems to have solved my issue ! hope this option could be included in Filmbox for us in built to roll off

@andrewfinch
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I'm glad the LUT works for you, however you should be aware that it was built assuming your footage was sRGB which is not the case, so whatever look it is producing is arbitrary and may be prone to further artifacting or undesirable color characteristics in other scenes. It is generally safer to start with an accurate color pipeline and produce whatever creative look you want using manual grade operations either before the filmbox node or between the negative and print nodes in a multi-node workflow.

@sibtainmushtaq
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sibtainmushtaq commented Nov 22, 2024 via email

@sibtainmushtaq
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can you explain how you made the highlight roll off lut please ?

@sibtainmushtaq
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I’m still surprised why this is doing this to be honest as I feel like I wasn’t seeing this issue before until my update on both Filmbox and DaVinci Is there a roll back option for Filmbox for me to test ? On Nov 22, 2024, at 11:27 PM, Andrew Finch @.> wrote:  I'm glad the LUT works for you, however you should be aware that it was built assuming your footage was sRGB which is not the case, so whatever look it is producing is arbitrary and may be prone to further artifacting or undesirable color characteristics in other scenes. It is generally safer to start with an accurate color pipeline and produce whatever creative look you want using manual grade operations either before the filmbox node or between the negative and print nodes in a multi-node workflow. — Reply to this email directly, view it on GitHub<#207 (comment)>, or unsubscribehttps://github.com/notifications/unsubscribe-auth/A3HYIHJK7OF2GW3VQFI3DCL2B6HTXAVCNFSM6AAAAABSID57BWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDIOJUG42DAOBQGA. You are receiving this because you authored the thread.Message ID: @.>

is there a roll back option for filmbox?

@andrewfinch
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in the Video Village Pluglins app you can select the gear icon on Filmbox > install alternate version . The LUT was made with curves in resolve.

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@gregcotten @andrewfinch @sibtainmushtaq