Originally Posted by LJG
How does one implement this in the Radiance, I do not see any options for HDR conversion, other than global video HDR on/off.
The color mapping and the adaptation of the ST2084 EOTF to the abilities of the display are only possible thanks to the good cooperation between LightSpace and the Radiance Pro. At the moment this is not possible with Calman 5.
LightSpace creates a 3-D-LUT based on the profiling of the display and calculates the color transformation from the REC2020-container (Ultra-Blu-ray) to the Colorspace of the Display. Therefore, for the profiling of the display, one does not take the color space REC709, but rather one that approximates the color space P3(DCI). Of course, later the display must run in exactly the mode with which was profiled. It does not even notice that the input signal actually corresponds to the HDR/REC2020 standard because it has been adapted to its capabilities.
The 3D-LUT from LightSpace allows the Radiance Pro to deliver the data from the REC2020-Container to the Non-HDR/REC2020-Display so that the display can interpret it correctly. Therefore the Radiance provides special CMS memories for HDR/REC2020-LUTs. However, I believe it is advantageous if the display can basically process 12-bit signals.
In addition LightSpace calculates a 1-D-LUT for the adaptation of the ST2084 EOTF. This adaptation causes the Radiance Pro, to change the gamma curve of the display, e.g. 2.2 to the ST2084-EOTF. When creating the LUT in LightSpace, you can set the limits for clipping and a soft clipping for the highlights of the HDR/REC2020 signal. Here it can be good that you have to calculate several LUTs to find a good compromise for the display and the setup.
The whole thing may sound very complicated, but it is really easy, because LightSpace and Radiance Pro do the actual hard work.
Basically, the LUT of LightSpace and the Radiance Pro do nothing but the internal HDR/REC2020 processes of a HDR/REC2020-capable display.
If you switch off this capability on an HDR/REC2020 capable device, you can also transfer the entire transformation process to the Radiance Pro. Depending on the quality of the internal processes of the display, it may be that the Radiance Pro does a lot better.
I hope this was understandable.