The Primate Keyer

Compositing
1

Hey
Iam doing a green screen shot I am using two Primatte keys one each for Garbage matte and the other as hold out matte and then another Primatte key for the main key. This script has become dog slow. is the Primatte key a slow keyer????

thanks guys

2

I dont understand why you use multiple keyers for garbaging and holding a matte. What you should do is

1) Make a decent key with the best edge result as possible and put the output to ALPHA

2- Using rotoshape, garbage and hold out what can be done easily.

3- Using dilate erode, shrink your matte a bit.

Now here is my method of keying

From you plate, plug a swithmatte node so that your plate is now into 2 nodes. The switchmatte and the primmate.

Under the primatte, MAX all your holdout stuff and MIN all your garbage stuff and pluus that part of the tree into the alpha part of the switchmatte

Now you can put a despill operation before the switchmatte

Here is a qucik exemple of what the tree could look like

http://hugoleveille.com/key.jpg

3

QUOTE(Hugo Leveille @ 12/18/06, 02:06 AM) [snapback]255117[/snapback]
I dont understand why you use multiple keyers for garbaging and holding a matte.

because it can often save a lot of tedious roto work ?

QUOTE
Here is a qucik exemple of what the tree could look like
http://hugoleveille.com/key.jpg

hmm, what do you use the primatte_v22 for? despill?
personally i use HueCurves most of the time, what does everybody else prefer?
++ christoph ++

4

Like I said, just use shape when you know it will work for all the shot

You have to use primatte if you want to redo the same despill as if you were pulling the matte thru only 1 Primatte. But any despill will work too. Matter of taste..