So I am supposed to shoot this POV shot of a guy opening a door behind which there's nothing but a black and white strobing light. The strobe will end up filling out the whole screen. Nothing should be visible behind the door.
Now I've already tried various things with lights and they worked fine (keying out brighter parts and underlay it with a strobing clip). Problem is we can't bring actual lights to the location. So I was thinking about using daylight instead. I want to make it look as real as possible so that when our protagonist opens the door the room he is standing in will sort of light up in the strobing light and the light should blow out the whole screen.
Is it a point of view shot or is the guy in the shot? How close to the door is the shot going to be? Like, can you see other stuff in the room? How bright is this strobe supposed to be?
From your description, it sounds like we're seeing the guy open the door from a pretty wide shot where you can see stuff in the room.
For this, you need to have lights on set. There is no good way to fake the light shining on the person or other objects in the room.
It's possible you could fake the shot with some fractal noise/turbulent noise coupled with Trapcode's Shine or CC Light Burst (or similar), but that's just for what's behind the door, getting the light to strobe in the room would be tricky.
Now, if you could shoot your shot with light pouring from the doorway and with no light coming from the doorway even if there's a long set up time between the two shots, you could cut them together to make it seem like it's strobing...
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Sorry for being unclear about this. It is going to be a point of view shot (talent not in shot except for hands maybe) and there won't be much to see on the side. The stairwell we are shooting in is pretty narrow and we'll probably shoot on a 35 or 50mm lens. Just to give you an idea.
Now what if we shoot it during daytime (the door leads to a courtyard) so that light would poor in from the outside? Any tips on how to make it strobing in that case?
I'd use a lighting effect like Video Copilot's Optical Flares or Red Giant Software's Knoll Light Factory.
A big benefit for using a practical light here will be that it will correctly illuminate other objects in the scene -- for example, as you are opening the door, a practical light would illuminate your talent's face. Relighting like this in post will be challenging.
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