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Yellow turns Orange (Chroma Key problem)

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Tré Batenga
Yellow turns Orange (Chroma Key problem)
on Jan 5, 2011 at 4:59:21 am

The yellow bag turns to orange. How do i retain the yellow color by not cropping the bag frame-by-frame? I tried to color correct it, but all the other colors got affected.

Tré Batenga
FCP Editor


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adam taylor
Re: Yellow turns Orange (Chroma Key problem)
on Jan 5, 2011 at 9:10:19 am

Yellow is comprised mainly of Red and Green in an RGB world, so removing the green from your image by keying will cause the problem you see.

What you will need to do is to mask the area you don't want to remove the green from. How tight the mask needs to be depends on how close the yellow is to the stuff you want removing. If one is in front of the other, then you will need to rotoscope your mask. yet if the two don't intersect, then a looser mask will probably suffice.

Its always worth being aware of the colours in a shot that you want to keep before you decide which colour to use for the chromakey....if you have a lot of yellow in front of the green screen, then you will have problems, and should have opted for a blue screen, as there is very little blue used in the yellow colour.

adam

Adam Taylor
Video Editor/Audio Mixer/ Compositor/Motion GFX/Barista
Character Options Ltd
Oldham, UK

http://www.sculptedbliss.co.uk


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Mark Suszko
Re: Yellow turns Orange (Chroma Key problem)
on Jan 5, 2011 at 2:28:08 pm

It is sometimes also possible to just tighten up the choice of color picked by the keyer, to make it a little more discriminating, while still pulling a good key.


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Dave LaRonde
Re: Yellow turns Orange (Chroma Key problem)
on Jan 5, 2011 at 5:10:54 pm

The chroma keyer is Motion is much, much better than that dog of a keyer found in Final Cut Pro. You may want to consider doing your chroma key in Motion.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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