Do you have access to the original Arriraws? If so, you could try to debayer them again in the Arriraw converter with a different setting (reducing sharpness to 0, for example).
Here is where you can get the converter from: http://www.arri.com/camera/digital_cameras/tools/arriraw_converter.html On Jun 29, 2012, at 10:26 AM, Aélis Héraud wrote: > -- Okay, I had some trouble sending this mail last night so I hope you'll > receive it now. Sorry for duplicates copies. -- > > Hi folks, I'd like to ask you something. > > We have to deal with some greenscreens in Alexa and I know some people have > had some trouble with it. Overall the greenscreens are pretty good and we're > able to get a good result, but we noticed something on the data and I'd like > to have your say on this matter. > > We noticed some artefacts in the Red and Blue channels, especially on the > thinner blond hairs. > The plates are in 2880x1620, it was recorded in ArriRaw (via T-Link) and then > converted in DPX (Colorspace AlexaV3LogC) so it's pretty much the best > quality we can have, there's no compression. > > <Mail Attachment.png> > > As you can see the RGB seems pretty much ok and the green channel is good, > but the red one has some pixels in staircase and I won't even talk about the > blue one. The last picture is a first key. > > After some investigations we're pretty sure it has something to do with the > debayering process. It's maybe due to the algorithm, the interpolation > between pixels isn't very good in the red and blue channel. I don't know > exactly but that's the only explanation we could come up with so far. > > My question is : Is there a way to fix it in Nuke without altering the data > (the good one) or are we stuck with that ? Any idea ? > > I tried to split the channels and to put a blur at 1 on the Red one and it > seemed to help a bit at first but eventually we can feel the softness and we > lose the thinner hairs, which I'd like to avoid. I'd keep that as my last > option. > > Our other option would be to ask the company who did the debayering but I'd > like to find another way. > > Thanks for the help > > Aelis > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users _______________________________________________ Nuke-users mailing list [email protected], http://forums.thefoundry.co.uk/ http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
