I've seen quite some green noise on alexa ... many people shoot 800 iso when shooting alexa ... this is BAD for vfx. ALSO if the look / lut have been "baked" in resulting in a rec709 output (hard to see on your grab) it easily get hard, since the alexa lut has quite a green tint.... TRY putting your read node to SRGB (optional a CC node to constrast the image) maybe it will give a better base for keying ... otherwise degrain could also help.
cheers jonas On 23 September 2011 02:44, Nick Guth <[email protected]> wrote: > Read brought in using AlexaV3LogC. > Has anyone had success with keying footage shot on the Alexa? It seems to > have a weird 422 look, but according to the documents it shoots 444. We > brought in the raw .mov from the camera and we're still getting poor > results. I attached an example of the before and after (one click key with > primatte). Why is it keying the edges around highlights? > Two of our shows are now shot on this camera and we're having a difficult > time getting positive results from it. If this was shot on RED it wouldn't > be a problem. Our work around for now is to roto everything and add > selective keys to the roto for details, unfortunately TV schedules don't > allow for such detailed workarounds. > Any help would be appreciated. Thanks! > > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > -- jonas drehn larsson axel heides gade 2, 7mf 2300 københavn s tel. +45 2371 3166 _______________________________________________ Nuke-users mailing list [email protected], http://forums.thefoundry.co.uk/ http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
