Blackmagic Forum

Hi!

I am just wondering, why there's a such big difference between color saturation of the clip in edit page and after export?
There's a edit page color I had to adjust (Keyed talent Color Boost - 50, background file Color Boost - 30)
[img][/img]

and here's exported file
[img][/img]

It seems that, despite almost the same recording conditions, sometimes the issue is more visible and sometimes less visible. This time I had to set values of Color Boost high to compensate final image. The same comes with keying efficiency - mostly it works without a problem but sometimes it happens that there are problems with key coverage. I don't know why.
Can anyone please explain how to avoid such things? I am exporting to h.265 UHD 50fps 30000 Kb/s (MacBook M4 Pro)

Try looking at the file using VLC or Potplayer.

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rNeil H wrote:Try looking at the file using VLC or Potplayer.

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Surely it makes a difference when I use VLC Player over QuickTime but why and how to change it in QT so it can shows more accurate colors?

More accurate doesn't really count here. Apple uses a non-standard display transform for Rec.709 of essentially gamma 1.96, rather than the specified gamma 2.4 of the Rec.709/Bt.1886 standard.

So inside Resolve you were seeing the more "correct" display transform, but in Qt Player, using the lighter gamma, a lighter less saturated image.

So technically, the Resolve image was "more accurate " but thanks to Apple's ColorSync, Qt Player, on Macs without Reference modes set to HDTV, you get what you're seeing.

On Macs with Reference modes set to HDTV, and most other things,the image is closer to what Resolve displays.

You can change the Resolve display transform if you choose, to match Apple.

Or not.

And in reality, no two screens ever show identical images, and ... no one will ever see exactly what you saw. Tis Life.

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Pick output gamma to Rec709-A

Apple devices has that issue. They have their own non-standard color spaces and gamma curves.

Now I have to take another drink! Read these:

"Grading for Mixed Delivery: Cinema, Home, and Every Screen in Between" by Cullen Kelly
https://blog.frame.io/2019/10/14/gradin ... -delivery/

and

"How to Deal with Levels: Full vs. Video"
by Dan Swierenga
https://www.thepostprocess.com/2019/09/ ... l-vs-video

and I think both cover the issues and the solutions very well. These videos also cover it:




Understanding color management is also helpful:

"Color Management for Video Editors"
https://jonnyelwyn.co.uk/film-and-video ... o-editors/

The above articles will explain why things change on different displays, different playback engines, and the importance of calibration and color-managed outputs.

I generally try to export a second or two of SMPTE Bars at the head of the project, and I import the file back into Resolve to check it on scopes to verify all the levels are correct. Using calibrated displays is a must -- without that, you have no idea what you're looking at. We also accept that the basic picture is going to change a little bit on different devices, because that's life.

akcivan wrote:Pick output gamma to Rec709-A

Apple devices has that issue. They have their own non-standard color spaces and gamma curves.

Where can I find such option? I don't see it in Display Settings. Only those:
[img][/img]
I have picked HDTV Video (BT.709-BT.1886) according to this video and it seems to not change the color scheme as it should but I can't adjust brightness any higher. How to manage this? When I add another Display with my own setting like below this changes everything but also I can not set the value on display brightness at any lower level - its on max.
[img][/img]
What to do and how to set the option you have mentioned?