Blackmagic Forum

Posted: **Sat Apr 28, 2018 9:00 pm**

In Beta2 the Rec2100 HLG Input Transform in the Color Management settings seems broken, it does not do anything different from scene light transformations, unlike using it in an explicit Color Space Transform in a node.

Posted: **Wed May 16, 2018 8:02 am**

I checked this in Beta 3 and it is still broken.

Take any Rec2100 HLG image.

If you use YRGB (unmanaged) and apply the following color space transform:

: transform-ok.jpg (45.25 KiB) Viewed 1875 times

Things work fine!

However using YRGB color managed:

: color-managed-not-ok.jpg (31.57 KiB) Viewed 1875 times

does not work properly.

Instead of using Rec.709 (Scene) Rec.709 Gamma 2.4 or Rec.709 Gamma 2.2 also give incorrect results.

Posted: **Sat May 19, 2018 7:09 pm**

Sorry for harping on this but I would appreciate if someone from Blackmagic could comment on this situation.

It seems that YRGB color managed does not distinguish between display and scene light. Unlike using the OFX Color Space Transform Rec.2100 HGL gives the same results as Rec.2100 HLG (Scene).

Is this still work in progress, a bug or not a bug at all?

Posted: **Sun May 20, 2018 3:21 pm**

Ok, it's not a bug but my mistake, the input dataspace of the clip in question was overridden at the clip level.

I am sorry for the confusion and hope this did not waste too much time.

Blackmagic Forum

Rec 2100 HLG in CM Mode in scene and display light

Rec 2100 HLG in CM Mode in scene and display light

Re: Rec 2100 HLG in Managed Color Mode Broken?

Re: Rec 2100 HLG in Managed Color Mode Broken

Re: Rec 2100 HLG in CM Mode in scene and display light