# The Primate Keyer
**URL:** https://forum.highend3d.com/t/the-primate-keyer/9509
**Category:** Compositing
**Tags:** shake
**Created:** [December 13, 2006, 5:38am UTC](https://forum.highend3d.com/t/the-primate-keyer/9509 "2006-12-13T05:38:20Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@user\_deleted](https://forum.highend3d.com/u/user_deleted)
#### Post date: [December 13, 2006, 5:38am UTC](https://forum.highend3d.com/t/the-primate-keyer/9509/1 "2006-12-13T05:38:20Z")
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
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### Author:  [@user\_deleted](https://forum.highend3d.com/u/user_deleted)
#### Post date: [December 18, 2006, 1:06am UTC](https://forum.highend3d.com/t/the-primate-keyer/9509/2 "2006-12-18T01:06:53Z")
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](http://hugoleveille.com/key.jpg)
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### Author:  [@user\_deleted](https://forum.highend3d.com/u/user_deleted)
#### Post date: [December 18, 2006, 2:20am UTC](https://forum.highend3d.com/t/the-primate-keyer/9509/3 "2006-12-18T02:20:28Z")
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](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 ++
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### Author:  [@user\_deleted](https://forum.highend3d.com/u/user_deleted)
#### Post date: [December 18, 2006, 9:43am UTC](https://forum.highend3d.com/t/the-primate-keyer/9509/4 "2006-12-18T09:43:30Z")
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..