This a bit off topic but there is a good article by Art Adams
http://provideocoalition.com/index.php/aadams/story/alexa_iso_settings_t he_least_you_need_to_know/ that explains the choice of 800 ISO as the Alexa sweet spot. I would always try and get the DOP to shoot blue/green with a lower ISO to reduce the noise, and even test the -3db (if they have enough light). It is not always practical, but always worth trying to have the conversation before the shoot. Neil Riley ________________________________ From: nuke-users-boun...@support.thefoundry.co.uk [mailto:nuke-users-boun...@support.thefoundry.co.uk] On Behalf Of James Etherington Sent: 27 September 2011 12:23 To: Nuke user discussion Subject: Re: [Nuke-users] Keying Issues with Alexa Neat still gives better results for me. The new Denoise is generally pretty good but makes it look a bit like shakes median filter. Also it seems to get detail from the red and green channel and puts it in the blue channel (which I think neat might do too) which can change the colour values. On Mon, Sep 26, 2011 at 8:56 PM, Randy Little <randyslit...@gmail.com> wrote: If you dont' have denoise tools I have some other chroma tricks that can work in NUKE as long as you only use the Mask (as one should anyway) If you have Maya then you have Toxik andI have seen nothing that denoises as well as the built in tool in Toxik. that thing is amazing. (well neat is about as good and works inside of nuke which is much nicer obviously. ) I haven't had a chance to use nuke 6.3 and the new denoise to compare yet. Has anyone compared Nukex Denoise with Neat video? Randy S. Little http://www.rslittle.com <http://reel.rslittle.com> On Mon, Sep 26, 2011 at 13:43, Howard Jones <mrhowardjo...@yahoo.com> wrote: 800 asa too, tungsten balanced (which I think will add more noise to blue). prores 4.4.4 but came out looking like 4.2.2 with so much noise I thought I was back on 16mm high asa stock. What ASA are people recommending, as low as you can go? Howard ________________________________ From: Howard Jones <mrhowardjo...@yahoo.com> To: Nuke user discussion <nuke-users@support.thefoundry.co.uk> Sent: Monday, 26 September 2011, 20:28 Subject: Re: [Nuke-users] Keying Issues with Alexa I've just had a terrible time with exactly that format - used the new denoise tool which cleaned it up well but was very very noisey to begin with - the blue channel was awful. Howard ________________________________ From: Nick Guth <nick.g...@gmail.com> To: Nuke user discussion <nuke-users@support.thefoundry.co.uk> Sent: Friday, 23 September 2011, 1:56 Subject: Re: [Nuke-users] Keying Issues with Alexa They were shot to AppleProRes444 (which is the Alexa native format). It's straight from the camera in a .mov file format. They were converted to DPX and are in the AlexaV3LogC colorspace in nuke. We also tried pulling the raw .mov directly into Nuke, but have the exact same result. -- Nick On Thu, Sep 22, 2011 at 5:51 PM, Deke Kincaid <dekekinc...@gmail.com> wrote: What file format we're they shot to and which colorspace? -deke On Thu, Sep 22, 2011 at 17:44, Nick Guth <nick.g...@gmail.com> 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 > Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > _______________________________________________ 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 -- Nick Guth motion . composite . design www.nickguth.com _______________________________________________ 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 _______________________________________________ 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 _______________________________________________ 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 _______________________________________________ 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 Registered Address: Passion Pictures Ltd, 33-34 Rathbone Place, London W1T 1JN. 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