How to color correct to a bright white background

Question

Hi there!

Hoping someone can steer me in the right direction. We recently filmed on a white screen so that we can overlap the speaker onto white ppt slides for a lecture. I received the footage in 4k CRM raw files and have to use a LUT to take it from the raw image to the color corrected image. I'm running into the issue where no matter the LUT or color changes I make, I cannot get the image to the natural looking and bright white backgorund. I feel like I'm close, but could anyone help me figure out what I'm missing?

R Neil Haugen · Answer

That's a very difficult thing to do, actually. As you need to lift the surrounding near-white pixels, without lifting those of the subject. It's really little different from green/blue screen working.

There are two ways to approach it ... the first is easier but works only if your white background/text area and subject will be static.

You use a feathered layer of Lumetri to 'lift' the pixels where it blends with the ppt image ... using a mask.

So you say have your ppt on V1, and the speaker on an upper track. You would put a mask around the speaker, feathered, and then 'below' the mask, Lumetri to lift the whites to 100IRE. Or whatever IRE level your ppt file shows as.

If the speaker waves their arms too much, this won't work.

If that is the case, you need to mask the whole subject pretty close, and track that mask. Adjust as needed. And then key out the background outside the mask.

This is pretty much the same task as green/blue screen working.

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