Keylight problem with the color Yellow

[Adam Taylor]

The way i have found to be most useful is this (apologies if it sounds a bit complex…it does work!)

1. in your comp, duplicate the greenscreen clip and select the upper most of the two tracks.
2. Apply a Hue/Saturation effect.
3. select the colorize option, and then rotate the colour angle until the color values of the greenscreen is sufficiently different to the yellow. it does not need to be green – you can rotate the value until you get as pure a colour as possible (ideally you want pure green, pure blue, pure red, etc. The Keylight effect works best if it has a pure colour value to work with, so if you can avoid blends all the better. Depending on how clean the shot is, you can even raise the saturation a little to improve the colour separations.

4. Apply Keylight (make sure its below the Hue/Saturation effect on the effects palette). Use the eyedropper to select your wildly adjusted greenscreen.
5. switch your display to show the alpha channel and adjust your keylight settings to give a clean edged mask.
6. when happy with the alpha channel, switch back to RGB, and on the lower track (the pristine untouched video) set the trackmatte to alpha.

You may need to do a little adjusting to get it just right and you may also need to do some further masking … but not often. I use this method to get some really clean keys when the foreground and background have been less than perfect and it works almost all the time.

good luck
Adam

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

http://www.sculptedbliss.co.uk

[Danny Winn]

Hey thank a lot Adam,

I will try this. I also got some good results by simply dropping the “Screen Balance” from 50% to about 10%, that helped too.

Thanks again.

[Adam Taylor]

keying is one of those things that sounds easy, but in practice can be anything but.
I came at this solution after trying loads of methods that all seemed lacking. I find this one to be pretty darned good almost all the time.

have fun.

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

http://www.sculptedbliss.co.uk

[Craig Swanson]

I used Adam’s approach and it worked well. I was keying LA Lakers on a green screen and the yellow jersey was a problem. Why don’t the Lakers use a blue screen for their media day shoot??

one note on the hue/saturation effect: I used the green channel to adjust to blue screen. I didn’t use colorize.

Thanks Adam!

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[Adam Taylor]

glad to hear it worked for you, Craig.
adam

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

http://www.sculptedbliss.co.uk

[Paul Whishaw]

I keyed my GS in Premiere. This post is 9 years old but the problem still persists. It’s amazing that the Ultra Key in Premiere seems to do a superior job over Keylight.

It is also insane that such a competant keyer exists in Premiere but there is no Untra Key in AE. It’s the same company.

[Doland Ruiz]

Holy crab, Ultra Key in premier worked! I also had green in the subject as well as blue and many other colors and keylight would key out my subject’s green even tho it was a pretty different green. Ultra did it automatically as soon as I eye dropped. No adjustments necessary. Thx for the tip!

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