Blackmagic Forum

So I am working in Davinci Wide Gamut via color space transform. And shooting BRAW in the BMCC 6kFF, it seemed like when I brought the clips into Davinci Resolve Studio 19 Beta, the proxies were created automatically, which was fine. The Proxies version looked accurate, but when I switch from use Proxies to use HQ version there is a color shift in the clip, to a non-normal or non-pleasing green tint. Is this normal? Is there an issue, or perhaps have I made an error?

And when I render it and output a video it has the green cast as well.

Disable performance mode and see if anything changes.

Preferences - User - Playback Settings.

How do you monitor?

VMFXBV wrote:Disable performance mode and see if anything changes.

Preferences - User - Playback Settings.

Andrew,

I gave it a try. Unfortunately, that did not work. I appreciate the suggestion though.

Uli Plank wrote:How do you monitor?

Uli,

I'm just working on my MacBook Pro, no external monitor.

Then don't expect it to look exactly the same. But try these settings (not my own findings), and compare the originals in your viewer to the rendered ones. You may need to ignore the proxies:

"Current settings to get the best visual match between Resolve viewer, Iina, QT player and iPhone on an M2 max XDR display and the Flanders CM250

Mac display profile(s):
1. HDR Video (P3-ST 2084) (got that from here, currently using this profile)
or
2. HDTV Video (BT.709-BT.1886) (Apply System Gamma Boost turned OFF)

Resolve settings:
Preferences -> System -> General
1. Use 10-bit precision in viewers if available CHECKED
2. Use Mac display color profile vor viewers CHECKED

Resolve Project settings:
Color management
1. Timeline color space: Rec.709-A
2. Output color space: Same as Timeline

Resolve Export setting for ProRes:
Advanced settings
Gamma Tag: Same as Project

For my own reference, but thought it would be good to have it here for others to discover

Strangely the default HDTV Video (BT.709-BT.1886) display profile seems 100% useless because of the gamma boost setting.

Steve added:
What I've found is that I must set my output color space and gamma to match my monitor and my delivery (my intent is to grade in 2.2 and deliver an output via CST to Rec709 gamma 2.2. With the viewers set in Resolve to use the Apple display profile (and the profile set to BT.1886 customized to gamma 2.2 I get an image in Resolve that looks identical to the feed to my external monitor which is also calibrated to gamma 2.2. So I'm good with this setup. Setting the custom BT.1886 to gamma 2.2 seemed to do the job. I tried setting the boost to 1.09 but didn't see any difference in the output but that may be because I'm using a gamma of 2.2 in my output from Resolve (output color space / gamma 2.2).

The only time I set tags to Rec709/Rec709-A is in the output file (does not encode as Rec709-A, this is just a trick tagging as explained in the post process article I linked to earlier.

So now I get agreement between my MacBook XDR display in Resolve, my external monitor and when I output my test video to YouTube and view it on my iPad Pro, it looks close enough be satisfy my needs.

Testing a bit more with the boost of 1.09 I found that the output file tagged 1-1-1 actually has a better correlation in the darkest regions with the Resolve viewer and my external viewer (so as viewed in QuickTime) so this is good to know.

Andrew added:
For those reference BT.1886 modes file has to be encoded with 1.96 gamma (Resolve Rec.709+2.2 gamma presets doesn't export 1.96, so this is a special case). Rec.709 Scene or 2.4 will export 1.96 encoded file, so then depending on your boost in ref mode setting you can have 2.4 or 2.2 final viewing. Thos are not pure gammas, so this may be a reason why it matches your ref screen better than pure 2.2 export+ 2.2 preview curve.

If 1.96 encoded file does give same preview as ref screen through ref mode with correct boost then this is actually good news Apple ref modes work very different than I thought, but at least now it's known what to expect.

So when you toggle proxies on/off, the color changes, with the proxies looking better than your originals?


Sent from my iPad using Tapatalk

visualfeast wrote:So when you toggle proxies on/off, the color changes, with the proxies looking better than your originals?


Sent from my iPad using Tapatalk

Exactly... that is correct.

Uli,

I'm not positive, but I don't believe it's my monitor settings. Because I don't have the same problem with CDNG footage from the original BMCC 2.5k in the same timeline. It is only an issue with the BRAW footage from the BMCC 6K FF.

Hopefully someone from the Blackmagic Team can point me in the right direction.

Can you post a short original clip to a cloud service?

Here is a short clip with the BRAW clip from my new BMCC 6k FF first and the CDNG clip from the BMCC 2.5k coming second.


https://www.dropbox.com/scl/fi/16tjxrsx ... 7fnpb&dl=0

And to be clear when I have it set to proxy and grade it, it does not look like this. It looks normalized. It is only when I click on Use HQ or render and output it that the green tint takes over.

I realize this is a new camera just got it on the sale. So not sure if that is the issue or if this is a Davinci Resolve issue.

Here are some screen shots of my project settings, CST in and CST out settings used.

CST in

CST out

Green tint when Prefer Camera Original is selected, and this is what it looks like when rendered out as well.

Ok.

So strangely I had some other BRAW shot from the other day. And none of them have the same issue as the one clip I had downloaded to compare with my CDNG clip. I can't explain it, I am baffled.

I have no idea what happened with the one clip mentioned above, but the rest seem fine. And I shot them all back to back. I will keep playing around with stuff, but it seems like it was just the one shot.

Unfortunately,

The issue has cropped up again on some shots I have done today. Same settings as previous. And just in case I am using a 2nd / different card reader, just in case that was an issue. Does not seem to be the issue. I am using an CFexpress card from the approved list, an Angelbird AV Pro SE 1 TB.

The one difference is this time the picture goes gray when you switch from Proxy to HQ. Pics of the issue below.

Help please Blackmagic Design.

Here is the same shot set to HQ. And in the same timeline the CDNG files from my BMCC 2.5k have no issues at all.

I will install latest beta version and see if I encounter the same.

As far as I know, you don’t need CST since you’re grading in color managed environment.

I tried to reproduce your problem, but it seems that DR 19 beta is fine. I used BRAW Q0 2.4:1 footage. My camera is same as yours with latest stable firmware, not the current beta.

I used your project settings. Added CST in/out.

Omar Mohammad wrote:I tried to reproduce your problem, but it seems that DR 19 beta is fine. I used BRAW Q0 2.4:1 footage. My camera is same as yours with latest stable firmware, not the current beta.
]

Omar thanks for trying that out. I appreciate it. You did mention something that rang a bell for me. When I updated the camera I grabbed the 8.6 beta instead of the the stable 8.5.1.

I wonder, do you think that could be the cause of the issue. What is frustrating whenever you buy a new cam, is that the card, card reader, camera etc. Everything is new and untested and so it is hard to rule anything out. At least for me.

Is there any things I should be aware of if I try to go back to the previous update for the camera?

You are welcome!

Dan Cotreau wrote:Is there any things I should be aware of if I try to go back to the previous update for the camera?

Nothing I am aware of. Unless you want to export your settings/profiles. Other than that, you are good to go. I would recommend falling back to previous stable firmware and try again. I hope you get it solved.

As for the cards, You got them new I assume, so I guess they are already updated. Send their support your cards serial numbers and ask them if they were up-to-date prior to shipping.

Omar Mohammad wrote:You are welcome!

Dan Cotreau wrote:Is there any things I should be aware of if I try to go back to the previous update for the camera?

Nothing I am aware of. Unless you want to export your settings/profiles. Other than that, you are good to go. I would recommend falling back to previous stable firmware and try again. I hope you get it solved.

As for the cards, You got them new I assume, so I guess they are already updated. Send their support your cards serial numbers and ask them if they were up-to-date prior to shipping.

Good ideas, I will thanks.

I have been really stumped because it was only on some clips and does not happen all the time. I couldn't always recreate the issue. So I took a closer look at the clips that were having issues vs. the one that were not. I noticed the gamma controls in the raw tab were available on the clips having a problem, while the ones that were normal looking had those controls grayed out.

Then I realized the clips having he issues, somehow had the color space set Blackmagic Design instead of Davinci Wide Gamut and the Gamma was set to Blackmagic Film instead of Davinci Intermediate.

Those setting un-gray the gamma controls and then the contrast button was slammed all the way to the left which of course grays out the picture.

I don't know how this happened, because those were not setting I chose nor the contrast change, but somehow it did. So hopefully that is what was causing these irregularities. And I know what to look for moving forward. I will update if the issue somehow continues, but for now just in case I plan to take Omar's advice and go back to non beta version for the camera.

I'm glad that you've figured out the problem.

I would recommend that you utilize RCM instead of CSTs, since you're dealing with BRAW.

Omar Mohammad wrote:I'm glad that you've figured out the problem.

I would recommend that you utilize RCM instead of CSTs, since you're dealing with BRAW.

Screenshot 2024-05-27 at 11.11.42 AM.png

I was using CST because I was comparing the footage and with some footage from my old BMCC 2.5k. So CDNG files mixed in and needed to process them separately. At least I think that is the case. Correct?

By the way your exterior shot looked really nice. I was going to ask if you used an ND filter in that shot and if so, which one? I'm thinking about grabbing a new one.

Honestly I don't know about CDNG files, I'm fairly new to videography and DR. However, when you're dealing with different formats, you can "bypass color management" for those clips and use CST instead.

Thank you, I'm glad you liked it No, I didn't use ND filters, my gimbal couldn't handle it not even with counterweight. I lowered ISO to 100 and increased f-stops. Post-production, I used qualifiers, power windows and curves.