Question on: Keylight (CS3) has blocked-grainy output
by Pat Jaeger (Pattyjae)
on
Feb 18, 2008 at 5:27:27 am
Hi, i recently saw a post asking why keylight has a blocky/grainy output after the matte has been created. I saw this really helpful reply but dont know how to correctly remove the spill on the 2nd layer with keylight so as to then create the good looking matte from there. Here is the original reply that i am referring to:
"Yup, that'll happen with Keylight if the video level of the keying color is too high. If you're looking at a scope, Keylight likes the color to come in about 40-45 IRE units, and I'd guess yours is at about 60 units or more.
The way I work around the problem is to do a 2-step key. I start with a good key, which you already have; please note I didn't say a good-LOOKING key... right now, yours is ugly. Then I duplicate the layer.
On the bottom layer, I reset the effect and play with it until I get spill removal, but the background goes gray in Keylight's final output setting. It takes a bit to get to that point, but then it suddenly gets easy. I use the layer above it -- the good key -- as an alpha matte, and Poof! I have a good key AND spill suppression."
sorry to repost but i replied to the original the other day but it is to far down the list to get any replies and this is rather urgent.
Re: Question on: Keylight (CS3) has blocked-grainy output by Dave LaRonde on Feb 18, 2008 at 3:27:47 pm
[Pat Jaeger]"I saw this really helpful reply but dont know how to correctly remove the spill on the 2nd layer with keylight "
It's tough to do. You might have to change the color that keylight uses to key. Your goal is to get an image that is pretty much all-white in Keylight's Status view. Then when you look at it in the Final Output, the keying background looks gray. Then you know spill suppression is working.
I personally don't have a set method to get to that point. I find it depends on the footage.
