This may be heresy but If you have access and time, maybe pass a matte out to after effects CC or whatever their latest version is. The paint matte refinement tool can sometimes do a really nice job. I've been using it where I'd normally difference key and bringing that matte back into Nuke to comp properly.
Cheers, Toby_______________________________________________ Nuke-users mailing list Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users