I've never quite seen how anything that crosses channels, if there's any anti-aliasing involved, can not have issues...
If a red and a blue matte meet, and there is anti-aliasing along the edges, causing a pixel to be (0.5, 0.0, 0.5), how is that different to a similar pixel along an antialiased edge where a magenta matte meets black... Hugh Macdonald nvizible – VISUAL EFFECTS [email protected] +44(0) 207 659 2038 +44(0) 7773 764 708 www.nvizible.com On 24 Mar 2011, at 23:08, Howard Jones wrote: > in that case btw the red matte would be separate to the magenta, any overlap > would be black in the respective channels. > > H > > From: Howard Jones <[email protected]> > To: Nuke user discussion <[email protected]> > Sent: Thu, 24 March, 2011 22:45:32 > Subject: Re: [Nuke-users] Extract CMY Color id > > should do... > > splits into > primary (rgb outside of cmy bnw) > secondary (cmy outside of rgb, bnw) > tertiary (bw (split into bnw) outside of rgb, cmy) > > H > > > From: Deke Kincaid <[email protected]> > To: Nuke user discussion <[email protected]> > Sent: Thu, 24 March, 2011 22:33:12 > Subject: Re: [Nuke-users] Extract CMY Color id > > This pulls perfect mattes even when you have a magenta and red matte > on top of each other or any other primary/secondary overlapping? > > -deke > > On Thu, Mar 24, 2011 at 15:17, Howard Jones <[email protected]> wrote: > > 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 > > > > > _______________________________________________ > 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
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