green or blue?

gms-9812 wrote on 9/16/2017, 2:49 AM

I'm looking for advice/opinions on green vs blue backgrounds for chroma keys. Is it a matter of personal preference or is one used in specific shots? As an example if I just grabbed a schmuck off the street and wanted him to be in various environments would a pro use one over the other? I have a lot of experience in photography but for video I'm still learning and will be pestering people with dopey questions for a while. I'm a quick learner.

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set wrote on 9/16/2017, 3:24 AM

I rarely doing green screen chroma-keying, but so far I know, Green has strong and stable video signal rather than blue. So that's why green is more preferred.

 

Just make sure your actor doesn't wear anything green or holding a green object.

(My quick way for this one)

Last changed by set on 9/16/2017, 3:24 AM, changed a total of 1 times.

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Former user wrote on 9/16/2017, 8:02 AM

Green is generally used because normally a person has no green colors or tones. If you use blue and the person has blue eyes (more common than green), you run a risk of bleedthrough.

Musicvid wrote on 9/16/2017, 8:56 AM

@david-tu

+1

gms-9812 wrote on 9/19/2017, 8:47 PM

Looks like I'll be buying a box if lime green dye. Thanks for the advice

Former user wrote on 9/19/2017, 11:15 PM

There are actually specific paints for chroma key green and blue. It can't be too reflective.

Musicvid wrote on 9/21/2017, 3:42 AM

Lime Green dye probably fluouresces. Cotton sheets definitely fluouresce. I don't think you want to go there.

gms-9812 wrote on 9/21/2017, 12:26 PM

I'll use a mat green paint then. Thanks fr the reminder. Or maybe I could use a non cotton sheet

Former user wrote on 9/21/2017, 12:53 PM

A lot of people say this is the best for the price.

Musicvid wrote on 9/21/2017, 9:24 PM

Or maybe I could use a non cotton sheet

No, synthetics can be just as bad, but at the opposite end of the visible spectrum.

Before I stopped shooting wedding stills for mental health relief, I had a pretty good scripted response for cyan bridal gowns and deep red tuxedos that the matrimonious did not know they were wearing.

The Chromakey learning curve is steep enough without a lot of wild chromaticities in the reflective spectrum. The best advice you will get is to not skimp on your greenscreen or lighting accuracy.