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Subject: Re: [AE] spill suppression
From: Chris Zwar <chris@chriszwar.com>
In-Reply-To: <list-4997889@media-motion.tv>
Date: Sat, 9 Mar 2013 08:01:32 +1100
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Message-Id: <16E3496B-EA2D-4FDD-B201-5C1D088BE0E8@chriszwar.com>
References: <list-4997889@media-motion.tv>
To: "After Effects Mail List" <AE-List@media-motion.tv>

On 09/03/2013, at 7:21 AM, Chris Meyer <chris@crishdesign.com> wrote:
> Quick poll: What's your favorite spill suppression utility or trick?=20=


Most of the time I simply use the AE spill suppressor.  I used to have =
the Key Correct plugins and I don't think I ever found a case where its =
spill suppressor - which is more fiddly to use than the standard AE one =
- did a better job.

I don't know if it's technically 'spill', but motion blur is the tricky =
thing to deal with when keying.  If the key isn't set up well then you =
can end up with footage that looks like it has a spill problem in moving =
areas - actually the screen is showing through semi-transparent regions. =
 This is where you need to adjust the 'screen balance' in Keylight, and =
if I can't get a good result then I'll use the Keylight edge colour =
correction, and reduce the saturation.  Otherwise I don't normally use =
the Keylight colour correction options.

The other technique I use if spill is bad is to create an edge matte and =
use it as an adjustment layer with the levels filter combined.  The edge =
matte is created in a precomp by having the keyed layer alpha matte a =
blurred version of itself (ie. drag the keyed layer into a new comp, =
duplicate it, blur the top layer, set it as an inverted alpha track =
matte).  When applied as an adjustment layer you can use the levels =
filter (or your favourite colour correction plugin) to compensate for =
the spill.

-Chris=