Cary Knoop wrote:You could set up an HLG to Rec709 workflow like this:
settings-hlg.jpg
The timeline gamma above is a log format, it is not essential to the result but depends on how you want the controls to work, you could for instance also use Rec709.
After this, you should map the wider dynamic range onto Rec709, Resolve also has tone mapping functionality but it is an auto mode, better to do it by hand to see what looks give based on the type of footage, exposure etc.
Hello Cary!
I have a strange problem with HLG.
What I need is to grade HLG (and have more dynamic range) to rec 709.
My settings for color management is exactly the same as on your screenshot.
But it doesn't work.
I have the setup with two displays, one with GUI and another connected via DeckLink MiniMonitor 4K.
I calibrated both GUI and DeckLink-connected monitor properly (for Rec 709 color space for sure); when I applying 3D LUT for GUI, I got exactly the same look in the viewer as on the monitor. I use GUI without 3D LUT therefore to have more control of how my grade may look on uncalibrated system (I work for stock videography, so I don't have a real client nor any particular technical requirements). I use QuickTime Viewer for preview; it don't have any color management and can't use the system CMS.
So, what is my problem?
1. When I use the setup explained above, with DaVinci's color management settings as on your screenshot (which is an expected setting for this task as far as I understand) I can easily get the colors I want on the calibrated display. But after export, the final clips look terrible, with a strong color cast, lake of contrast, and oversaturated colors with lost details. It is more similar to clips' look in a color viewer without 3D LUT but worse, it is not even close match.
2. When I turning off all luts in color management, both for viewer and monitor, I can have something "acceptable" on the screen, but after render the clips appear very different anyway (and again, with flat dull colors but harsh gradients and oversaturated colors and missed details).
3. But if I set color management to "DaVinci YRGB" with Timeline color space Rec 708 Gamma 2.4, the things are changing totally. I can grade clips what I want (I use 3D LUT Creator to set a proper color space conversion, then I polishing grade in DaVinci) and after render, I have clips with perfect colors matching closely the screen.
Another funny thing is: when I grading in HLG, the difference in colors in the not-calibrated GUI color viewer and on the calibrated external monitor is HUGE and way over the real difference between two displays, with perfect colors on the monitor but dull and oversaturated colors in the GUI, and resulting clips don't match GUI nor monitor looks, even they are closer to the GUI as I explained in p.1. But when I grading in REC709, the looks on the calibrated monitor and in the not-calibrated GUI are different for sure, but this is a "real difference" between two displays (some differences in color tone, brightness, and saturation which are totally understandable), and the final clips going pretty close to the GUI but same time you may consider them as "close enough to the monitor to be good".
I can't explain this. Help me to understand, please!