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Re: keying out soft subjects

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Darby Edelen
Re: keying out soft subjects
on Jul 29, 2012 at 7:29:15 pm

Here's another way to try and suppress the spill if you're using the Intermediate result.

Add another instance of the unkeyed footage above your key. Enable this layer's "Preserve Transparency" switch and add the Channel Mixer effect to that footage. Change the Channel Mixer "Green" settings to:

Green-Red: 50
Green-Green: 0
Green-Blue: 50

This will replace Green values in your footage with an average of the Red and Blue values.

Finally set the upper layer to the Darken blend mode, this will only replace the Green values where the Green value is greater than the average of Red + Blue values, effectively you'll clamp the Green values in the footage to the Red + Blue values.

Nothing could possibly have a green tint at this point, but you may not be entirely happy with the result (colors may shift). In that case, change the Green-Red, Green-Blue or even Green-Green values to change the look.

If the Green-Red, Green-Green and Green-Blue values ever combine to more than 100 then you will be adding additional Green into the footage. That may be desirable though.

I'd recommend just playing with the values to see what you like.

Darby Edelen


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