I just did this gizmo, you can pick any color choose if you want extract a
matte or apply the alpha on your picture with a premult if you want. Of
course I agree with Deke this way suck, an exr with matte is better but I
prefer several RGB matte pass.
set cut_paste_input [stack 0]
version 6.2 v2
push $cut_paste_input
Group {
name Select_color
selected true
xpos -168
ypos 2
addUserKnob {20 User}
addUserKnob {41 color T Constant1.color}
addUserKnob {6 out_alpha l "Out Alpha" +STARTLINE}
addUserKnob {6 premult +STARTLINE}
}
Constant {
inputs 0
channels rgb
color {0.3005436957 0.02121900581 0.3762620389 1}
last 100000
name Constant1
xpos 38
ypos 109
}
Input {
inputs 0
selected true
xpos -101
ypos 86
}
Difference {
inputs 2
gain 90
name Difference1
xpos -101
ypos 126
}
Invert {
channels alpha
name Invert1
xpos -101
ypos 171
}
Premult {
name Premult1
xpos -101
ypos 209
disable {{!parent.premult i}}
}
Shuffle {
red alpha
green alpha
blue alpha
name Shuffle1
xpos -101
ypos 235
disable {{!parent.out_alpha i}}
}
Output {
name Output1
xpos -101
ypos 287
}
end_group
On Thu, Mar 24, 2011 at 8:57 PM, Deke Kincaid <[email protected]> wrote:
> 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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--
Julien Chandelle
GSM : +32 (0) 494 277 542
julienchandelle.be <http://www.julienchandelle.be>
|| Nuke , AE & Fusion Compositor ||
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