Hello,
Setting up the brightness seems to be very difficult for me. and i dont think that should be this much hard and i totally believe this problem related to one of my hardwares(either webcam or projector). the calibration panel is precisely 90 degree and i am sure of it.
Below image shows what is wrong with my setup. in the middle channel there are some places that brightness are high. and other channels shows the brightness are even low.
how do you manage the brightness to be same at all parts?!
Regards,