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using keylight to key out white background?

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Patryk Rebiszusing keylight to key out white background?
by on Apr 16, 2010 at 12:25:20 pm

I have a problematic bunch of shots where the subject was recorded on white background, but the white background is... well, grayish rather then white. I thought to use keylight to keyout the white (gray) but each time I apply it it does nothing to the footage. Amy I using a wrong plug-in here?

Patryk Rebisz
Director/DP
http://www.patrykrebisz.com
(917) 291-2565


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Ken EvansRe: using keylight to key out white background?
by on Apr 16, 2010 at 1:15:56 pm

I've found that keylight works well in some scenarios and bad in others. Try the colour keyer instead.


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Matthew WoodsRe: using keylight to key out white background?
by on Apr 16, 2010 at 3:47:10 pm

I don't find the color keyer very clean. The best way I find to key something on a white or black backdrop is to duplicate the layer, desaturate the top layer (either with hue saturation, or shift channels whichever gives you the best result, The black and white effect in CS5 might work well too). Then use the levels effect to get a high contrast silhouette. Finally, set the lower layer to use the top layer as either a luma matte, or inverted luma matte depending on if you started with a white or black backdrop.

Hope that helps,

-Matt



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Chris WrightRe: using keylight to key out white background?
by on Apr 16, 2010 at 4:33:27 pm

Here's my AE cs3 procedural keyer for luma/sat.

use matte adj controls layer to create a procedural matte keyer using the inner/outer sliders


http://www.megaupload.com/?d=AA6X17LF

http://technicolorsoftware.hostzi.com/


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Patryk RebiszRe: using keylight to key out white background?
by on Apr 16, 2010 at 5:00:30 pm

Chris can you elaborate just a bit?

Patryk Rebisz
Director/DP
http://www.patrykrebisz.com
(917) 291-2565


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Chris WrightRe: using keylight to key out white background?
by on Apr 16, 2010 at 5:08:42 pm

I made an easy to use matte keyer. Simply select the matte adj controls composition and click on the adjustment layer.

Its effect controls inner/outer b/w mattes are scripted to
run an alpha/saturation channel on your footage that you can see in the output composition.


http://technicolorsoftware.hostzi.com/


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Dave LaRondeRe: using keylight to key out white background?
by on Apr 19, 2010 at 4:46:09 pm

[Chris Wright] "I made an easy to use matte keyer. Simply select the matte adj controls composition and click on the adjustment layer.

Its effect controls inner/outer b/w mattes are scripted to run an alpha/saturation channel on your footage that you can see in the output composition. "


Forgive me, but that sounds like the inventor who tries to create the perfect waterproof screen door for a submarine.

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


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Chris RuckertRe: using keylight to key out white background?
by on Apr 18, 2010 at 5:32:43 am

keylight pulls very good keys on chroma (color, green or blue) but us useless on pulling keys on white.
It is not you, it is keylight. Procedural keying is the only way to go, albeit more complicated.



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Dave LaRondeRe: using keylight to key out white background?
by on Apr 19, 2010 at 1:24:38 pm

Folks, there's a reason why blue screen and green screen techniques were developed.

IT'S BECAUSE KEYING OFF OF WHITE DOESN'T WORK! Cripes, doesn't anybody get that?

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


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Oliver SmithRe: using keylight to key out white background?
by on Aug 7, 2010 at 9:06:29 am

A (half) decent way to key away a white background is to use keylight to pick the colours of your subject until it disappears leaving only the white background, and then use this layer as an Alpha Inverted Matte of the same bit of footage...

This has worked well for me in the past


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Danny HaysRe: using keylight to key out white background?
by on Aug 19, 2010 at 6:25:45 am





Ultra will do it.



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Danny HaysRe: using keylight to key out white background?
by on Aug 19, 2010 at 7:44:02 am

Granted, there was no real white in that flower, and one click gave me that key. Here's alot harded one where I had to tweek it, still not perfect but it will depend on how much white is in your clip.







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