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M
mmattimore
Participant
February 25, 2020
Question

Chroma Keying a subject that's green and blue

  • February 25, 2020
  • 2 replies
  • 2455 views

I have a subject that I want to shoot some video with using after effects. The problem is the subject is both green and blue. Does anyone have any recommendations on what color to go with? I have a grey screen, but I hear that doesn't key well.

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2 replies

Mylenium
Mylenium
Legend
February 26, 2020

Start by getting that pesky notion of "keying" out of your head. Even against a grey background you might be able to isolate the subjects with a few simple channel operations to generate a matte. Oldschool compositing techniques can be often just as effective, you know...

 

Mylenium

R
Community Expert
Rick GerardCommunity Expert
Community Expert
February 25, 2020

Find a color across the color wheel from green and blue or shoot against a white BG. I'd have to see the subject to give you a better idea.

M
mmattimoreAuthor
Participant
February 26, 2020

Here's my guy. I'm leaning toward Red, but a bit nervous about his pink hair.

R
Community Expert
Rick GerardCommunity Expert
Community Expert
February 26, 2020

Try taking that shot into After Effects, add Keylight, look at the combined matte, increase the screen gain a bit, clip white and black, then start playing with the key color. You can pretty quickly see where you are going to have to create hold out mattes and which colors will give you the best results with most of the shot. 

This red color gets me a pretty good key for most of the shirt and body leaving the nose, gloves, and whites in the costume so some roto is going to be necessary to include those parts.

 

If you don't have access to the hardware/filter combinations that make this job easiest You might be better off shooting against white and just doing a little roto on the eyes and the white parts of the costume. Lighting is going to be very important.

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