here's a solution based on colour expressions which pipes
(pure)secondary colors like magenta into the alpha. have look at the
expressions (the '-r*g*b' bit is only to hold out the white in my
example)
not the most elegant solution tho' having secondary colours as IDs
set cut_paste_input [stack 0]
version 6.2 v2
ColorBars {
inputs 0
barintensity 1
PAL true
name ColorBars1
selected true
xpos 153
ypos -181
}
set N1bfb1770 [stack 0]
Expression {
channel3 rgba
expr3 min(r,b)-r*g*b
name Expression3
label MAGENTA
selected true
xpos 23
ypos -33
}
push $N1bfb1770
Expression {
channel3 rgba
expr3 min(g,b)-r*g*b
name Expression1
label CYAN
selected true
xpos 153
ypos -35
}
push $N1bfb1770
Expression {
channel3 rgba
expr3 min(r,g)-r*g*b
name Expression2
label YELLOW
selected true
xpos 268
ypos -34
}
Keyer is pretty much it. There are gizmos which just automate doing
id channels on nukepedia and creativecrash but underneath they are all
just keyers.
For future though, get your cg guys to render multiple mattes to a
single exr instead of using id's which just suck, especially pink that
it likes to throw in there. There are mel scripts for Mental Ray and
Vray which automate doing this.
-deke
On Thu, Mar 24, 2011 at 12:50, Spider <[email protected]> wrote:
Hi everyone,
I have a question maybe already ask (i checked before)
i'd like to know what is the best way to extract CMY to make a object matte,
i guess that their is a better way than use keying nodes.
May someone can light me ?
i put in attachement an example.
Thanks.
Spider
--
Luddnel Spider Magne | Director - Lead Motion Compositor
555Lab – Alchemy between you and us
24 rue du Pré St-Gervais 93500 Pantin
Office (+33)148 453 555 | Fax (+33)171 864 387
Mobile (+33)699 434 555 | 555lab.com
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