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IDProjectCategoryView StatusLast Update
0000892DCP-o-maticFeaturespublic2018-10-17 20:15
ReporterOlivier Assigned Tocarl  
PrioritynormalSeverityminorReproducibilityhave not tried
Status closedResolutionfixed 
PlatformMac OSOS XOS Version10.9
Target Version2.10.0 
Summary0000892: Add new color conversion - tested

I can't add note to reply to carl in the issue ID 0000832. (may be due to my "reporter" status)
So a add an new Issue, sorry
I've tested the new color conversion option, they work fine with DPX exported from Davinci Resolve12.5
Nonetheless it's now possible more useful to have a Rec2020 with also a gamma with 2.4
Thanks for your work

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related to 0000832 acknowledgedcarl Fix colour conversions 



2016-06-17 13:23

administrator   ~0001302

So you think there should be a second Rec 2020 preset with input gamma 2.4? Is that the linearised gamma function like the current preset?


2016-06-17 13:28

reporter   ~0001303

Last edited: 2016-06-17 13:29

Yes A second rec2020 preset with a gamma 2.4 should be even better !!
It's the same gamma as the BT 1886 : 2.4
Thanks again


2016-06-17 13:44

administrator   ~0001304

Isn't the current gamma correction defined as part of Rec 2020? How can it be Rec 2020 if it has a different gamma? Perhaps I misunderstand.


2016-06-17 18:54

reporter   ~0001305

I'm no expert but what i understand is that :
in resolve there is 2 différents color space and gamma for Rec2020

  • Rec2020
    -Rec2020 gamma 2.4
    If I use the first color space/gamma for my dpx then I load them in dcp-o-matic with the new rec2020 preset, it fine
    But if I use the second color space/gamma, with the same new preset it is not good.

When I chose edit in the colorspace menu, It shows that rec2020 preset hasn't got a 2.4 gamma ... or i misunderstand something !!:-)


2016-08-03 08:29

reporter   ~0001365

Last edited: 2016-08-03 08:30

Ok I dig further:
Rec709 has a gamma similar to 2,35 but it's for HD Cameras
BT 1886 has a true gamma of 2,4 it's for HD Monitor and distribution
Rec2020 has a true gamma 2,4 it's for UHD Monitor and distribution

So in DCP-o-Matic 2.9
The gamma of Rec2020 preset isn't correct
Rec709 should be labeled "Rec709 Gamma 2,2"
May be add Rec 709 preset with a gamma with a linear start
I'm clear enough ?
Thanks in advance


2016-08-12 13:35

administrator   ~0001368

Last edited: 2016-08-12 13:35

Hi Olivier,

Thanks for your notes. I've changed the Rec2020 gamma to 2.4 in my local copy.

Do you have any references for the use of a Rec 709 preset with linearised gamma?

I'll have a think about renaming the existing Rec 709 preset. I'm tempted to leave it as-is to avoid confusions...



2016-10-06 10:56

administrator   ~0001450

I believe this is all ok now; please leave a note if not. I'd like to see some reference to use of Rec.709 with linearised gamma before I add a preset for it. Thanks!

Bug History

Date Modified Username Field Change
2016-06-15 15:10 Olivier New Bug
2016-06-17 13:23 carl Note Added: 0001302
2016-06-17 13:23 carl Assigned To => carl
2016-06-17 13:23 carl Status new => feedback
2016-06-17 13:28 Olivier Note Added: 0001303
2016-06-17 13:28 Olivier Status feedback => assigned
2016-06-17 13:29 Olivier Note Edited: 0001303
2016-06-17 13:44 carl Note Added: 0001304
2016-06-17 13:44 carl Status assigned => feedback
2016-06-17 18:54 Olivier Note Added: 0001305
2016-06-17 18:54 Olivier Status feedback => assigned
2016-07-04 13:44 carl Target Version => 2.10.0
2016-08-03 08:29 Olivier Note Added: 0001365
2016-08-03 08:30 Olivier Note Edited: 0001365
2016-08-12 13:35 carl Note Added: 0001368
2016-08-12 13:35 carl Note Edited: 0001368
2016-08-12 13:54 carl Status assigned => feedback
2016-08-12 14:06 carl Relationship added related to 0000832
2016-10-06 10:56 carl Note Added: 0001450
2016-10-06 10:56 carl Status feedback => resolved
2016-10-06 10:56 carl Resolution open => fixed
2018-10-17 20:15 carl Status resolved => closed