Keying out overexposed areas

[connorc56915483]

Hello everyone. I'm trying to dial in a lighting effect.

I want to overexpose parts of a video, and in premiere, make it so anything overexposed is keyed out to reveal a layer below.

Ultrakey doesn't seem to grab the pure white of a blown out area. Selecting white manually is also not working. Overexposure may be different than white is what I'm gathering.

I know that with the SCREEN blending mode anything darker than the layer below will be keyed out. None of the other blending modes seem to give me the opposite effect of anything overexposed into white being keyed out.

Any help would be appreciated.

[Mike Dziennik]

Have you tried the Luma Key effect?