Hi! It looks like on the colorspace node you did, you only changed the primaries to ACES but left the Illuminant to D65 ( instead of ACES ).
In which case the matrix will be: 1.53818 -0.351359 -0.166865 -0.129178 1.01683 0.0953645 -0.0112418 0.0599613 0.880791 Could that be it? /Håkan On 20 October 2014 13:05, Simon Björk <[email protected]> wrote: > Deke: I was sure I that it was in this (very interesting) thread > <https://groups.google.com/forum/#!topic/academyaces/9b4VuqPcOHQ> I read > it, but I'm actually unable to find it at the moment. It was not an > official matrix. > > Ben: Thanks a lot for those links. I will see if I can get your script > working. Interesting about the color temperature by the way, I didn't know > that. > > Best regards, > Simon > > > > > > ------------------------------- > Simon Björk > Compositor/TD > > +46 (0)70-2859503 > www.bjorkvisuals.com > > 2014-10-20 4:44 GMT+02:00 Ben Dickson <[email protected]>: > >> > Can you point to the ACES to sRGB matrix you found? >> >> It'll just be the ACES -> XYZ multiplied with an XYZ->sRGB matrix. >> >> You could use a ColorMatrix node to convert from ACES->XYZ, then a >> second ColorMatrix to go from XYZ->sRGB using the appropriate matrix >> from, say, >> >> >> http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html#WSMatrices >> >> >> > I've been playing with the colorspace node in Nuke to convert an >> > ACES file into AlexaV3LogC (primaries only). Anyone know if the >> > matrix used by the colorspace node is correct? >> >> Not sure. It might depend how accurate you want to be. If you look here: >> >> >> https://github.com/ampas/aces-dev/tree/master/transforms/ctl/idt/vendorSupplied/arri/alexa >> ..specifically this file: >> >> https://github.com/ampas/aces-dev/blob/master/transforms/ctl/idt/vendorSupplied/arri/alexa/AlexaParameters-2013-Nov-13/Alexa_aces_matrix.txt >> >> ..has different matrices for each colour temperature (for when >> converting from Alexa footage to ACES) >> >> More simply, if you just want to do basic conversion from ACES to sRGB >> gamut, then you could use this code: >> https://gist.github.com/dbr/24cfd1033c2d59f263e3 >> (as described above, by calculating the ACES->XYZ matrix then XYZ->your >> target gamut) >> >> >> On 20/10/14 12:01, Deke Kincaid wrote: >> > Can you point to the ACES to sRGB matrix you found? The matrices that >> > are published from the Academy are going from XYZ to ACES and vs versa. >> > >> > -- >> > Deke Kincaid >> > Creative Specialist >> > The Foundry >> > Skype: dekekincaid >> > Tel: (310) 399 4555 - Mobile: (310) 883 4313 >> > Web: www.thefoundry.co.uk <http://www.thefoundry.co.uk/> >> > Email: [email protected] <mailto:[email protected]> >> > >> > On Sun, Oct 19, 2014 at 5:18 AM, Simon Björk <[email protected] >> > <mailto:[email protected]>> wrote: >> > >> > I've been playing with the colorspace node in Nuke to convert an >> > ACES file into AlexaV3LogC (primaries only). Anyone know if the >> > matrix used by the colorspace node is correct? >> > >> > Colorspace matrix (ACES->AlexaV3LogC): >> > 1.53461874, -0.354506, -0.180112 >> > -0.128879, 1.02594, 0.102936 >> > -0.0112158, 0.0604984, 0.950717 >> > >> > The reason that I'm unsure is that I've seen a ACES->sRGB matrix on >> > another mailing list that does not match the values I find in Nuke. >> > >> > Best regards, >> > Simon >> > >> > ------------------------------- >> > Simon Björk >> > Compositor/TD >> > >> > +46 (0)70-2859503 <tel:%2B46%20%280%2970-2859503> >> > www.bjorkvisuals.com <http://www.bjorkvisuals.com> >> > >> > _______________________________________________ >> > Nuke-users mailing list >> > [email protected] >> > <mailto:[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 >> > >> >> -- >> ben dickson >> 2D TD | [email protected] >> rising sun pictures | www.rsp.com.au >> _______________________________________________ >> 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 > -- Håkan Blomdahl Filmgate AB Järntorget 3 413 04 Göteborg Sweden www.filmgate.se [email protected] +46 (0)31- 701 02 00
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