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A good keyer for DV (using Keylight)

Fri Jun 18, 2004 11:38 am

This is a combination of effects that will greatly enhance keying for DV orginated footage.
The original recipe (invented by Mats Olsson) is a combination of Channel Combiner (to go from RGB to YUV space),
Channel Blur (to blur the green and blue channels, which will reduce some of the noise in those channels and avoid
the horrible blocky edges you can get), and then a second instance of Channel Combiner to jump back to RGB space.

Add Keylight to the mix (color pick your green or blue screen) and you have what I'd call as close as possible to a perfect key (if your footage is not too bad, but this preset will also work on poorly lit footage).


Example :

If I start out with this image, which is a good example because it is a low res jpeg, that also is not so well lit (see the shadow of the arm on the background, the seam in the green fabric and all the shadows).


I apply the preset, and I end up with this not bad looking result (considering the source), with basically one click.


And here is my alpha

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A good keyer for DV (using Keylight)

Tue Jul 06, 2004 9:34 am

That's a great preset. The only thing I would add is a Screen Pre-blur. I find that it tends to help when using really bad DV.
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Wed Mar 15, 2006 1:11 pm

That is one terrific preset....thank you so very much for your hard work.
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Location: Auckland

Should there be any changes made for this to work with 4:2:0

Tue Apr 25, 2006 2:25 pm

Should there be any changes made for this to work well with PAL DV 4:2:0?

(Most American NTSC DV I believe is 4:1:1)
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Location: Sunderland/Newcastle

Fri Jan 12, 2007 9:35 am

Fantastic! thanks!
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Location: Milwaukee, WI

Wed Feb 14, 2007 6:57 pm

Thanks!!! This solved a big problem I was having!!!
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Location: Seattle, WA, USA

Sat Jul 28, 2007 11:28 am

This is a very handy animation preset. I just added a link to this thread from the "Keying overview" section of After Effects CS3 Help. One thing that I mention there is that the version of the Keylight effect that this animation preset refers to is different from the one included with After Effects CS3, so users will have to tweak the animation preset to use the new Keylight (1.2) effect.

BTW, I encourage all of you to use the Add Comment button at the bottom of each After Effects Help page on the Web to add links that point from Help to threads on this forum. There's a lot of useful stuff here, and users would certainly benefit from having links from relevant Help pages to scripts, presets, and expressions provided in this forum.
Todd Kopriva, Adobe Systems Incorporated
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Re: A good keyer for DV (using Keylight)

Thu Feb 28, 2008 9:12 am

Updated the preset to work with Keylight 1.2
(4.43 KiB) Downloaded 3322 times

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Re: A good keyer for DV (using Keylight)

Thu Mar 04, 2010 10:24 am

Thanks so much for this great preset! My footage was so bad I had soft blurred edges (almost like a light wrap). I added a Levels effect after Keylight (selected only Alpha) and pulled the whites and blacks into the middle, its like a more refined Black & White clip. It really created a clean edge but didn't eat into the details (like around the ears).

Hope this helps. great work!
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Re: A good keyer for DV (using Keylight)

Tue Aug 17, 2010 11:21 am

So I have some half-decent DV greenscreen footage (MOV re-wrapped from MTS AVCHD footage) at a good resolution. In AE CS4, I've made a garbage mask around my footage, and I have the KeyerforDV preset for Keylight 1.2 (yes, I checked for the proper version). I select my footage layer, apply the preset... and all I see is my mask with a feathered green glow inside (see the attached image for what I get "out of the box" when I apply it).

Any idea what's going on here? Does it have to do with the mask? If so, is there a way to garbage matte something and still be able to use your great preset? Please let me know!

Thank you,

This is what happens when I apply the preset to my masked green screen footage.
screen_1_ML.png (280.72 KiB) Viewed 32046 times
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Joined: Sat Oct 04, 2014 7:36 pm

Re: A good keyer for DV (using Keylight)

Fri Oct 10, 2014 5:04 am

Thanks for sharing. The preset was great. The picture can be enhanced with various effects. Cool animation: D

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