For those testing ACES workflows, I'd recommend downloading the latest OCIO ACES configuration from the opencolor website:
http://github.com/imageworks/OpenColorIO-Configs/zipball/master http://opencolorio.org/downloads.html The ACES project is still very much a work in progress, and this link will allow you to experiment with the latest v0.1.1 RRT (the RRT is the core component of the HDR linear "ACES" -> display viewing transform). For those on Nuke, please point OCIO at the config.ocio file in the 'aces' subdir. (The configuration labeled config_1_0_3.ocio will not currently work in vanilla Nuke, as it uses tetrahedral interpolation which was only added to OCIO 1.0.3; Nuke 6.3 ships with OCIO 1.0.0). To answer the original question of how can you load display-referred imagery such as 709 or sRGB into ACES, this is currently being worked on, and we hope to have an updated profile in the near future to make this easy. As you would expect, this conversion from 709/srgb->scene linear requires inverting the viewing transform to synthesize plausible HDR values, which when viewed under the RRT appear the same as the original. The current v0.1.1 ACES workflow is not amenable to such an inversion, but they are aware that this is a critical component of color workflows, and as such hope to have a modified viewing transform /inverse ready soon. :) -- Jeremy On Fri, Aug 31, 2012 at 8:38 AM, Francois Lord <li...@francoislord.com> wrote: > I haven't put much time and research into it yet, so I can't help you with > the aces workflow. > However, be careful with the AlexaLogC colorspace. Since its gamut is > different, if you only change the colorspace from linear to logc without > changing the primaries, you could end up with slightly off colors when > converting to aces. It depends on the logc to aces conversion. I don't know > what gamut it expects from the logc images. > > > On 31/08/2012 05:13, Schneider, Abraham wrote: >> >> Hi there! >> >> I just played around with the OCIO nodes/modes in Nuke 6.3v8. I also had a >> look at the ACES workflow/config from the opencolorIO.org website. I've >> added this 'aces' config to Nuke by adding the config.ocio as the custom >> config. >> >> Seems to work fine so far. But there is one thing in this whole >> setup/config that I doesn't really get: how do I use sRGB/rec709/video >> footage (stills and/or movies) in a ACES environment? Normally I'd assume to >> switch the Read node to raw and/or linear (because the Read doesn't support >> OCIO yet), add a OCIOColorSpace, set IN to something like sRGB/rec709/etc. >> and the OUT to aces, to convert the image to the ACES colorspace. But there >> is no IN setting for sRGB/rech709/etc.! I can convert ARRI logC, analog film >> scans (cineon coded), sLog, etc., but not 'video' or other display referred >> encoded material (neither in the iff config coming by default with Nuke nor >> in the aces config from opencolorio.org). So how am I supposed to use still >> images, video stock footage, etc. in an ACES workflow in Nuke? >> >> Only way I tried it at the moment was to switch the Read to "sRGB" (or >> rec709 or gamma 2.2 etc.), add a normal Colorspace after the read that >> converts from linear to AlexaV3LogC and add a OCIOColorSpace with IN = >> 'logc' and OUT = 'aces'. Seems to work, but doesn't seem to be a clever way. >> >> Do I miss something or is this just not supported at the moment in this >> ACES config/workflow? Using the 'spi-vfx' config in comparison, there is the >> option to set the IN to 'vd8' or 'vd10' or something like that. But >> 'spi-vfx' is not using the ACES colorspace, right? >> >> Abraham >> >> >> Abraham Schneider >> Head of VFX pipeline / VFX Supervisor >> >> >> ARRI Film & TV Services GmbH >> Tuerkenstr. 89 >> D-80799 Muenchen / Germany >> >> Phone +49 89 3809-1269 >> >> EMail aschnei...@arri.de >> www.arri.de/filmtv >> ________________________________ >> >> >> ARRI Film & TV Services GmbH >> Sitz: München Registergericht: Amtsgericht München >> Handelsregisternummer: HRB 69396 >> Geschäftsführer: Franz Kraus, Dr. Martin Prillmann, Josef Reidinger >> _______________________________________________ >> 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