Is Dolby Vision a colorspace?

[wyup]

In tonemapping options:

src_csp, dst_csp
Respectively source and output color space.
0: SDR
1: HDR10
2: HLG
3: DOVI
Default: src_csp = 1; dst_csp = 0.

How is Dolby Vision a colorspace? I thought it is mostly a propietary tonemapping algorithm for tvs and media players. AFAIK, movies with Dolby Vision are mostly in Rec.2020 colorspace and PQ, that's to say: HDR10.

[quietvoid]

It's not just about tone mapping, it's its own colorspace when we're talking about profile 5. Because it requires reshaping to become PQ/Rec.2020.

[wyup]

So then should I use DOVI colourspace instead of HDR10 with profile 5 upwards for increased precision? What is exactly DV colorspace: BT.2020 with IPTPQc2/ICTCP representation? I guess 4k/HDR10 content is mostly mastered in PQ colorspace, hence DV might be in broader Rec.2020. Does it have to do with FEL 12-bit layer or is independent?

[quietvoid]

So then should I use DOVI colourspace instead of HDR10 with profile 5 upwards for increased precision?

You have to use it for profile 5 or anything you want reshaping processed.

What is exactly DV colorspace: BT.2020 with IPTPQc2/ICTCP representation?

Yes.

Does it have to do with FEL 12-bit layer or is independent?

Profile 7 may have reshaping as well, but the EL part is done after reshaping.

[wyup]

But in reality, it is not another colorspace. It is BT.2020 with full range, ICtCp representation and a cross talk matrix. But for that to be consistent, the movie should be graded in BT.2020 and normally mastering monitor is P3, as reported by the HDR10 colorspace metadata. I haven't seen any content with BT.2020 mastering monitor metadata, even if some actual content is outside P3.