Originally Posted by cogdok
Set displaycal to DCI P3, set projector to BT2020, and madTPG auto selects DCI P3 color patches or do I manually set madTPG to BT2020?
the only option in madVR that has an effect on the 3D LUT SDR creation is send BT 2020 which you should use in this case.
DCI P3 D65 should be correct not DCI P3.
madTPG doesn't have to send color patches in DCI P3 or bt 709 or what ever it just send a range from 0-255 and displaycal reads it.
this is different with HDR and you don't want HDR.
if your projector works correctly you don't even have to set it to bt 2020 all it needs is the report 2020 option in madVR.
Then the resulting 3DLUT gets auto installed in the DCI slot in madvr - delete it from the DCI slot and put it in the BT2020 slot and colors should be accurate then?
it should be in the DCI p3 slot and in the end it doesn't matter you could install them in any slot madVR reads the head and know ok this is DCI P3
Verification won’t give good results when doing this because a lot of colors won’t come close to BT2020. Is there a good way to verify these results with displaycal?
you are creating a DCI P3 D65 lut so why should the verification check for BT 2020?
Also, should I check ‘disable GPU gamma ramps’ in madvr when using a 3DLUT or does that setting matter?
doesn't really matter for the 3D LUT but if one is loaded i would use this option.
just in general you could increase image quality further by creating 2 readings one with "send bt 2020" and one with the projector set to bt 709 without the use of report bt 2020.
with a very simple profiel you can now automatic change your projector from wide gamut mode and bt 709 mode by just sending report bt 2020 with HDR and if it isn't hdr the profile is to choice not to send bt 2020.
only the 3D LUT for HDR should be gamma 2.2 the normal one can be the usual gamma 2.4 bt 1886 or what ever you like.
the option of gamma in the projector it's usually best to get one that is as close to the native gamma of the projector as possible.