How to create a 3D LUT file with ICC profile for MadVR?

[Random Account]

Hi everyone,

I’m trying to create a 3D LUT file using my ICC profile to use with MadVR, specifically in SDR mode with “tone map HDR using pixel shaders” enabled. However, I’m having trouble selecting the full range RGB (0-255). I’ve chosen my ICC profile and set the output to MadVR’s 3D LUT format, but I’m unsure about the best settings for my setup.

Attached is a screenshot of my current settings. Any advice would be greatly appreciated!

Attachments:

You must be logged in to view attached files.

[Vincent]

madvr expects 16-235 range, then after all procesing expands to whatever you choose in monitor output.
Also using SDR mode + HDR to SDR conversion by madVR assumes that source colorspace is SDR Rec2020 g2.2. Here madVR will to PQ to g2.2 with shaders

[Random Account]

So my are settings completely correct? My monitors ICC profile is chosen in the destination profile section, and I’ve no idea about rendering intent setting.

[Random Account]

What does PQ mean bro I have no idea. Just tell me the settings pls im not trying gonna be a director I just wanna watch the movie

[Vincent]

For SDR content, source Rec709 gamma 2.4 relative, as a general rule without specific info about your display contrast.
For HDR using madVR conversion from HDR to SDR, do as instructed before (message 2), source Rec2020 gamma 2.2 because that is what madVR expects.

Create these 2 LUT3D and place them in their respective boxes in madVR for SDR LUT3D calibration, for HDR enable tinemap using pixel shaders and that’s all.

[Random Account]

My monitor is gamma 2.2 so i chose that. There is no rec2020 in 3d lut settings, you meant bt2020? I tried both rec709 and bt2020, both are washed out as hell when using hdr to sdr tonemapping with pixel shaders. Btw I do not know why but creat 3d lut button is greyed out if i do not select something else in 3d lut file format and select madvr again.

[Vincent]

My monitor is gamma 2.2.

And? Anyway if you want SDR Rec709 as g2.2 is up to user…

There is no rec2020 in 3d lut settings, you meant bt2020?

Yes. But plain one BT2020 color profile, not HDR option sin combo box.

I tried both rec709 and bt2020, both are washed out as hell when using hdr to sdr tonemapping with pixel shaders.

Then your madVR configuration is wrong or you placed LUT3Ds in the wrong boxes. Or you use wrong test files.

HDR to SDR with pixelshaders takes Rec2020 PQ encoded content, traslates it to same colorspace but SDR g2.2, then translate to your monitor capabilities using a SDR to SDR LUT3D

Btw I do not know why but creat 3d lut button is greyed out if i do not select something else in 3d lut file format and select madvr again.

IDNK what you saying.

• This reply was modified 1 week, 2 days ago by Vincent.

[Random Account]

I did everything correctly, should i try with 2.4 as well?

[Vincent]

2,4 is meant only for Rec709 SDR slot in madVR. If you wish to use HDR->SDR with pixel shaders place Rec2020 g2.2 LUT3D in SDR rec2020 slot.

[Author]

Posts