Blackmagic Forum

Since 16.1 all my exports (MOV (h284 and ProRes) and MP4) are tagged with colorprofile (1-2-1) which is sRGB (g2.2) I think...

Only workaround for now is to use the automator to change it in HD (1-1-1)!

Maybe a bug?
OSX update?

I am still on High Sierra...

Somebody else have this issue?

Very annoying!

I think it is an attempt of Resolve to finally "fix" the "gamma" issue on OSX.

That is great!

But what I think is missing is a video or a small pdf from Blackmagic Design explaining how those new settings actually work in 16.1.

Thomas Maier wrote:tagged with colorprofile (1-2-1) which is sRGB (g2.2) I think...

It's Rec709 Gamma 2.4 (strictly speaking the 2 is for an assignable gamma value), as you can see in the Media Pool if you bring it back in (under the Input Colour Space Column).

Thomas Maier wrote:use the automator to change it in HD (1-1-1)

How do you do this?

I figured out, there was another problem in my workflow...

Maybe I got professionally blinkered!


Done some tests...

Conclusion:

@Cary
- Yes, I think also Resolve finally is doing it in the right way.

So, maybe I have to change the Subject!


@Tom
- Yes, didn't know:
1-2-1 means there is some "custom" gamma assigned.
Set the system to
Rec.709 Gamma 2.4 > profile is 1-2-1 with 2.4
Rec.709 Gamma 2.2 > profile is 1-2-1 with 2.2

but:
Set the system to
Rec.709 (Scene) > profile is 1-1-1, which you also can see resolve it the "Input Color Space" tap!


OSX Automater.app:
you edit a workflow or service (right click menu).
You will find something like "set colorprofile" in the library under movies (I have german version).
BUT you cant set a specific gamma, only HD or SD or RGB...

Haven't used it for years, because back in the days the was no profile at all in any export of any program as I remember...


Cheers!

Hello,

But this color profil is just a metadata for information only or it has influence on the way it’s displayed?

For example. I output a Prores4444 in Rec709, g 2.4 to generate a DCP into EasyDCP. Normally I inform Easydcp that the input is in 2.4. So this embedded color profil shouldn’t have any influence, no?

Best

Robin

Robin Erard wrote:Hello,

But this color profil is just a metadata for information only or it has influence on the way it’s displayed?

For example. I output a Prores4444 in Rec709, g 2.4 to generate a DCP into EasyDCP. Normally I inform Easydcp that the input is in 2.4. So this embedded color profil shouldn’t have any influence, no?

Best

Robin

Yes, it's only a tag or metadata.

If you import them for example in Resolve (DaVinci YRGB, not Color Managed) this will be ignored.
Tested it with ProRes422HQ files.

For example Quicktime using (trying) it to display it "correctly" on your display, if it's correctly calibrated/profiled via ICC...


That's likely what's Resolve using, if you checked "Use Mac Display Color Profiles for Viewers".
It should be the same!
But it is not! Gamut maybe, but gamma NO!
There are still some issues with this option, like with the Monitor/Viewer LUT not working correct on Edit Page!
But this is another issue...

Please read this topic viewtopic.php?f=21&t=101253 all possible problem sources and solutions are described in details there

Thanks!

The search function didn't find this...

This link can be usefull if any body have the same issues with the NCLC tags metadata:

https://github.com/bbc/qtff-parameter-e ... e8pcQ4na8g

Also a quick option to get 1-1-1 instead of 1-2-1 is setup the metadata tags:

Colospace Tags: Rec.709
Gamma Tag: Rec.709-A

Cheers.

The Video Patcher by Alex Mogurenko has a great tool to set such parameters, not only for QT, but for MXF too.

Did some tests. YouTube is all over the place.

Reference source GretagMacbeth colour checker ( See PNG Attached ).
0 53 117 180 249 255

Rec 709 Scene set in Color Management.(With correction Just to get a proper picture from the timeline)
0 45 112 179 249 254 Quicktime
1 36 90 151 223 228 YouTube

Rec 709 Scene set in Color Management.No Correction.( Picture on the timeline goes low contrast in the dark patches)
0 73 135 192 250 255 Quicktime
1 58 112 166 224 228 YouTube

Rec 709 gamma 2.4 set in Color Management.Export Rec709_Rec709A Deliver Page
0 73 135 192 250 255 Quicktime
1 58 112 166 224 228 YouTube

709 gamma 2.4 set in Color Management. Export as Timeline Deliver Page
0 53 117 180 249 255 Quicktime
1 58 112 166 224 228 YouTube
This last one is the only one which give me a transparant image with no gamma shift on my timeline. The Quicktime export is also transparant all the others have a shift in gamma.