Color Space and Gamma when exporting From Davinci Resolve

[bcslaam]

Thanks for your reply Carsten, I did actually export the DCI compliant J2000 in DR as you'll notice in my original email, in my quoted spec of method 1. you must of missed it.

There are two confirmed methods of doing DCI compliant export in DR:

1. Format = JPEG2000, Codec = Kakadu DCI, this method produces J2000 image sequence only, no audio, then we do audio separately using our own pull up method of choice.

2. Format = DCP, Codec = Kakadu JPEG 2000, this produced a DCP of sorts (without OV/VF or naming logic) where audio was pulled up to 24fps which in the past was always resampled to 96khz first, but now updates have corrected it to allow choice of 96 and 48khz. I set to 48.

Regarding colour, I have since discovered that the colourist set Colour science to Davinci YPRG, but Project space to Davinci WG/intermedia and output space to Rec 709 gamma 2.4
It is such an ambiguous area. I got help from AI and in deliver page we set colour space tag to Rec 709 and gamma tag to gamma 2.4, because it wasnt being set automatically due to the WG/intermediate project colour space, even though output space was set to rec709 gamma 2.4 in project settings!

Its seems counterintuitive, but by doing this we are telling DR what it is now, not what we want it to be, this is the concept I wasn't grasping fully. And so then DR knew to change it automatically from rec709 gamma 2.4 to DCI XYZ
This then gave a successful import in DCPoMatic, it was automatically recognized as DCI XYZ and colour result was good.

[AgD]

Hi Carsten and team.

First of all, thank you for all your support and for such a wonderful app.

Maybe a little bit off topic, but I was wondering if you could help me confirm if these settings from Davinci Resolve are correct.

Since I have some specific look for the burnt-in subtitles that I need for a short film, and I wasn't able to replicate them on DCP O Matic fully, I went for the path of doing the whole DCP in Davinci on this opportunity.

My settings are:
Color space tag: Rec709
Gamma Tag: Rec709A
Since these are the color space and gamma settings, which I believe the Short film was exported.

I'm importing this on DCP OMatic Player, and it looks good, I believe.
Are these settings ok in this case, will they work when I play the DCP in a cinema projector?

- I also exported a Plan B using DCI XYZ(color space) and DCI (gamma), from the same Rec709 ProRes, but, in this case, I see the green shift in my computer.

So I'm wondering which of the two options is the right one for cinema.

Thank you in advance!

All the best,

[Carsten]

The rec.709/A settings should be correct. Sometimes you need to look closer to the actual numbers, though, e.g. gamma may be different for different rec.709 presets. Very often, rec.709 uses gamma 2.2, but sometimes it uses 2.4 (which is catered for in BT.1886).

Can you supply sample images with the green shift?