Invert Keylight Effect?

[Andy George]

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

[Triple Dot]

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

[Eqysterika Nima]

Thank you!!!