Quote:
Originally Posted by Grampa 
This is a general question. How can calibration be done properly for a theater that is used almost exclusively at night?
I have a basement HT that uses a projector. The light control is not great, but the room is quite dark in the evening, when we generally view movies and TV. I assume most of the ISF calibrators here work only during the daytime. So how would you compensate for the difference in viewing conditions between day and night? Or do you make night calls also?

This is a general question. How can calibration be done properly for a theater that is used almost exclusively at night?
I have a basement HT that uses a projector. The light control is not great, but the room is quite dark in the evening, when we generally view movies and TV. I assume most of the ISF calibrators here work only during the daytime. So how would you compensate for the difference in viewing conditions between day and night? Or do you make night calls also?
ISF calibrations absolutely have to be done in near-darkness conditions, ideally in total darkness conditions. We are even instructed to wear dark colored clothing, as reflections off bright colored clothing can slew our results. There's no way to do one accurately when there's light streaming in thru a window during the daytime, or under skylights that are a couple of stories up and cannot be light controlled. That is, not without completely shielding the display from that light, by shrouding it in black coverings. Which is really hard to do with configurations that involve projector and screen being separate from each other by a sizeable open space.
The typical ISF calibration sets your display up for 2 room light conditions - one for darkness like at night, the other for daytime viewing. You switch between the 2 as needed.
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