A good keyer for DV (using Keylight)

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Posts: 137
Joined: June 5th, 2004, 8:05 am
Location: Los Angeles, CA

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

Posts: 3
Joined: June 18th, 2004, 6:59 pm

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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Joined: March 15th, 2006, 11:02 am

That is one terrific preset....thank you so very much for your hard work.
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Joined: April 25th, 2006, 4:59 am
Location: Auckland

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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Joined: December 5th, 2006, 2:09 pm
Location: Sunderland/Newcastle

Fantastic! thanks!
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Joined: February 14th, 2007, 3:25 pm
Location: Milwaukee, WI

Thanks!!! This solved a big problem I was having!!!
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Joined: July 20th, 2007, 11:13 pm
Location: Seattle, WA, USA

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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Enhancement master
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Joined: June 17th, 2004, 9:27 am
Location: New York City, NY

Updated the preset to work with Keylight 1.2
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Joined: August 12th, 2008, 11:40 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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Joined: August 17th, 2010, 10:00 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.
This is what happens when I apply the preset to my masked green screen footage.
screen_1_ML.png (280.72 KiB) Viewed 54262 times
Posts: 3
Joined: October 4th, 2014, 7:36 pm

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