Hi <Shameless plug> my secondary colour node on nukepedia/creative crash - splits any image into rgb, cmy and bnw (black neutral whites). The output will show you any set of above ie rgb, cmy, bnw mapped into the rgb channels.
So plug in your image choose cmy (as rgb) and in the rgb channels you will have cyan magenta and yellow mapped to rgb respectively, so as long as its pure cmy you get perfect mattes instantly </Shameless plug> Howard ________________________________ From: Spider <[email protected]> To: Nuke user discussion <[email protected]> Sent: Thu, 24 March, 2011 20:14:50 Subject: Re: [Nuke-users] Extract CMY Color id Merci Julien, I'll try this at home in few minutes. Maybe my 3d gay, sorry i mean guy like pink ;) Spider 2011/3/24 Julien Chandelle <[email protected]> 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 >>> >>> _______________________________________________ >>> Nuke-users mailing list >>> [email protected] >>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>> >>> >>_______________________________________________ >>Nuke-users mailing list >>[email protected] >>http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> > > >-- >Julien Chandelle >GSM : +32 (0) 494 277 542 >julienchandelle.be >|| Nuke , AE & Fusion Compositor || > > >_______________________________________________ >Nuke-users mailing list >[email protected] >http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > > -- 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
_______________________________________________ Nuke-users mailing list [email protected] http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
