ADOBE AFTER EFFECTS: Forum Expressions Tutorials Creative Cloud

Invert Keylight Effect?

COW Forums : Adobe After Effects

<< PREVIOUS   •   FAQ   •   VIEW ALL   •   PRINT   •   NEXT >>
Johnny Quinn Alston
Invert Keylight Effect?
on Jun 9, 2010 at 7:42:26 pm

Hi all,

Is there anyway to invert the keying effect that Keylight 2.1 does on a specific color? I need to actually keep the the moving green color in my image and not use anything else.

-JQA


Return to posts index

Dave LaRonde
Re: Invert Keylight Effect?
on Jun 9, 2010 at 7:57:49 pm

Easy: pull the key, precomp the layer, then use the Invert and Fill effects in that order. Change the Fill color to whatever you want.

You precomp the keylight layer so you can use garbage mattes on it with no problems.

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


Return to posts index

Johnny Quinn Alston
Re: Invert Keylight Effect?
on Jun 9, 2010 at 8:18:02 pm

Hey Thanks!

May I ask, how did you know to include the Fill effect? I had already by this point figured out to just use the Invert effect, but as you probably know it was looking pretty shoddy... so the Fill effect really gives me a nice clean line (I am keying migratory paths of 6th grade students in NYC's Silk Road Connect program that were hand drawn so that you can see their drawing but not them).

Like, I can see what the Fill is doing, but not exactly sure why without the fill it looks so weak.

Thanks again,





-JQA


Return to posts index


Dave LaRonde
Re: Invert Keylight Effect?
on Jun 9, 2010 at 8:24:50 pm

[Johnny Quinn Alston] "how did you know to include the Fill effect? "

Simple: fill lets you change the color of a layer to whatever you want, and it doesn't work on areas of transparency.

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


Return to posts index

Eqysterika Nima
Re: Invert Keylight Effect?
on Nov 20, 2015 at 8:07:23 pm

Thank you!!!


Return to posts index

Andy George
Re: Invert Keylight Effect?
on Jun 9, 2010 at 8:01:22 pm

Hi Johnny,
That type of functionality is not built directly into keylight, but can be done
pretty easily.

Here is how I would do it.

1. Duplicate your footage to be keyed
2. On the top copy pull your key like you normally would
3. Apply the tint effect to your finished key. Change the black
value to white so that you have a completely white image. We will use
this as a luma matt to tell AE what information to display.
4. Precompose your luma matt
5. go back to your original footage copy. This needs to sit directly
below your luma matt in stacking order. Change the track matt to Luma Matt inverted.
This tells AE to use the black pixel values of the above layer to determine the opacity of the lower layer-

-Andy


Return to posts index


Dave LaRonde
Re: Invert Keylight Effect?
on Jun 9, 2010 at 8:20:34 pm

....and there's another way to skin this cat, too.

In keylight, there are various views you can use. Find the one that shows the matte it generates, play with the Change Channel or Set Channel effect to make the alpha channel read the luminance, invert it and use Fill.

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


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]