I am still learning but this is my understanding. It is not a dynamic correction. So if things on your display change, bulb light, gamma, CMS settings, colorspace, etc.. after the calibration it will not correct them. Its just a look up table. This color was X and should be Y so add whatever correction. This is why its still a good idea to create a new calibration or lut file after say every 500 hours of lamp life.Then the conclusion is the if you set the gamma to 2.4 it will not „correct“ it to 2.2.
So you need to do a gamma calibration before you create a 3D LUT? I thought it will be done with the 3D LUT.
Lets assume you gamma will drift and you create a new 3D LUT, it will not fix the drift or did I misunderstood it?
For gamma.. you dont need to do a gamma calibration first. You are correct, it will adjust it. So lets say your display was a gamma 2.0, and in your lut configuration you say you want 2.2. You will have a 2.2 gamma after. However, if you then change your gamma settings on your projector, your not going to have a 2.2 anymore. The correction table in the lut file is wrong at that point.
The suggestion for a remote hotkey to change gamma was not at the projector level but in MadVR. MadVR will process the additional gamma change after the lut file is processed. So all the lut file correction is done and then MadVR can do additional things on top of that.