Hi Gary, no worries, I'm not sure if anyone knows whats going on with the BMD color science (myself included).
I'm away from my workstation for a while, so I can't have a look at files you uploaded. If we ignore the dng for a while and just compare the film and video prores files. - Import the film version and set the colorspace to raw. Try to import the cube file (bmdfilm to linear) in a OCIOFileTransfer node. Hopefully that brings the file into linear space without clipping values, but it might not work correctly. In that case you can open the file in a text editor. I don't remember if you should delete some of the lines, but try adding a ColorLookup and right click in the lut area and import as ASCI. Again, I don't remember the settings here but it is possible to bring in the curve. Once I get back I can send a setup to you if you want. Anyway, if this all worked you should now have a linearized version of the BMDFilm source. - For the video prores file, try with rec709, gamma 1.8, 2,2 and srgb. Does anyone look similar to the linearized BMDFilm version? And by similar, I mean the "gamma" curve. The actual colors will not be the same. This is becuse the video file uses rec709 primaries and the film version uses custom primaries, also called BMDFilm. If it doesn't match with any of those options that means the video file uses a custom curve, while still calling it rec709. In that case it's time to go out for a beer. As for the primaries you can try to get them to match up manually using a ColorMatrix node or use some automatic tools (like the mmColorChart you posted). This is becuse Blackmagic haven't made the matrix official. Sorry I can't be of much help. I did have a look at this for a show not that long ago and I ended up matching the primaries "close enough". Also note I don't claim to be an expert on this, this is just my experience. /Simon Skickat från min iPhone > 13 jul 2015 kl. 20:55 skrev Gary Jaeger <[email protected]>: > > Thanks Simon. I’m going to be an idiot here for a second. The more I think I > know about color science the more I’m reminded I don’t. > > https://www.dropbox.com/s/frp6d2bxpkhbg4o/chart.zip?dl=0 > > So there is a .nk along with source. I shot a chart (damn, looks like we need > a new one. scratch!) three ways: > > 1. DNG (which is film) > 2. ProRes (film) > 3. ProRes (video) > > saved the nuke with all default settings as the clips were dropped in. > > So setting the ProRes film file to AlexaV3LogC colorspace does get it closer > to the Video clip, until I change the ProRes Video to rec709, which I would > assume I would want to do since “video” in BMD terms IS rec709. > > And when you say “import the lut directly” what do you mean? > > Gary Jaeger // Core Studio > 249 Princeton Avenue > Half Moon Bay, CA 94019 > 650.728.7957 (direct) > 650.728.7060 (main) > http://corestudio.com > >> On Jul 12, 2015, at 1:25 AM, Simon Björk <[email protected]> wrote: >> >> Yes, the lut ships with resolve, you should find it in the lut folder. If >> you can't import the lut directly (or if it clips values), open the lut in a >> text editor and import into a ColorLookup node. >> >> I don't have any experiences with dngs in Nuke and I agree that it would be >> nice to have the option. >> >> Problem is Blackmagic haven't released the primaries for BMDFilm, which >> makes it hard to use. You could approximate them (for example by using the >> included BMDFilm to Rec709 lut as a reference). That beeing said, it might >> also be enough to treat the primaries as Alexa footage, it's not that much >> off. >> >> Skickat från min iPhone >> >>> 12 jul 2015 kl. 04:43 skrev Gary Jaeger <[email protected]>: >>> >>> Thanks Toby. I’ve actually done that, and I don’t mean to be a pain it’s >>> just that what I’d *rather* do is take the footage (whether dng or prores) >>> simply drop into nuke and set the proper colorspace. Probably because I’m >>> more familiar with nuke for one thing :) Just like we can do with most all >>> the other footage we deal with. I’d be ok with using an OCIOFileTransform >>> too, but I need to figure out the proper .cube file as well as the settings >>> for the .dng file if that’s what I’m doing. >>> >>> Anybody from the foundry have any insights? >>> >>> Gary Jaeger // Core Studio >>> 249 Princeton Avenue >>> Half Moon Bay, CA 94019 >>> 650.728.7957 (direct) >>> 650.728.7060 (main) >>> http://corestudio.com >>> >>>> On Jul 11, 2015, at 7:29 PM, Toby Angwin <[email protected]> wrote: >>>> >>>> The most straightforward way is to put them through Resolve and export >>>> them the way you want them as EXRs (or whatever). It will save you more >>>> time than trying to beat them into submission in Nuke. I used that on the >>>> last show I did where I did a 10 second grade to get them more in line >>>> with the Alexa, then output EXRs. >>>> >>>> Also if you can do that I’d recommend using ACES inside resolve as it gets >>>> the nicest image out of the files. >>>> >>>> >>>> Cheers, >>>> >>>> Toby >>>> >>>> Toby Angwin >>>> http://www.soupkitchenfilms.net >>>> http://vimeo.com/channels/soupkitchenfilms >>>> T: +61 (0)411830554 >>>> Skype: soupkitchen >>>> >>>> _______________________________________________ >>>> 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 >> _______________________________________________ >> 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 _______________________________________________ Nuke-users mailing list [email protected], http://forums.thefoundry.co.uk/ http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
