Sub-Space Gamut/EOTF
The Sub-Space Gamut/EOTF option allows the selection of any colour space - preset or user - to be used as a Sub-Space target for profile measurements.
When enabled, the Sub-Space colour space is treated as the Target colour space, enabling a display calibrated for a different colour space - say DCI P3 - to be profiled as if it were actually calibrated to the Sub-Space colour space - say Rec709 - to verify if the display can accurately cover the Sub-Space colour space.
The Enable tick box enables the use of Sub-Space when profiling, with the graphs plotting based on the Sub-Space colour space.
My intent is verifying my OLED HDR which is ST2084 REC2020 based, but has ST2084 P3 D65 capabilities.
My expectation is that, by using this feature, during profiling (measurements), only plotting is affected. What instead I have verified, with Pgenerator generating patterns and first watching displayed colours and later IP tracing, is that the levels I have set in manual measure are modified before being sent to the Pgenerator. For example, using as target space ST2084 REC 2020 and as sub-space ST2084 P3 D65, RGB (64,940,64) is converted to (788,934,560), that, anyhow, is the value mapping the ST2084 DCI P3 Green to ST2084 REC2020 Green.
I have also tried clicking on the sub-space calibration field in Graph Options, but the behaviour does not change.
PS: to tell that, if I run measurements without enabling sub-space, then, by enabling sub-space, I get what I am interested to. Curious, that, when only enabling sub-space, I see two patches being sent: the one I see in manual measures sliders and then the converted one. | 