in fact just looking at OCIO website dt8 might be the best option when converting sRGB to linear
"dt8, dt16 DT 8,16 - Diffuse texture colorspaces. These colorspaces are used for the conversion of textures painted in video space into a range limited linear space for use in rendering. The Color space is based on the vd transformation but limits the conversion into linear space so that no values above diffuse white can be created. This ensures that textures do not add light to a render. This is achieved by using a matrix transformation to limit the mapping of vd to the linear value of diffuse white." Neil Scholes +44(0) 7977 456 197 www.uvfilms.co.uk On 31 Aug 2012, at 14:26, Schneider, Abraham wrote: > Hm, but in this way, you're not working in ACES colorspace at all!, because > the standard colorspace node transforms from sRGB to Nuke linear, which has > different chromaticities and maybe whitepoint than the ACES colorspace? But > how do you combine this sRGB-to-Nuke-linear footage with ACES encoded other > footage? > > Abraham > > > Am 31.08.2012 um 15:28 schrieb Neil Scholes: > >> Thats what i do - reading in sRGB sequence as linear >> >> plonk down a standard colorspace node setting input to sRGB output to Linear >> >> do any comp work / grading >> >> put down a final colorspace node setting input to Linear - output to sRGB >> >> set the display LUT to RAW(sRGB) - >> >> (or use a OCIO display node with input color space set to srgb8, display >> device sRGB and view transform Raw. >> >> >> >> >> Neil Scholes >> >> +44(0) 7977 456 197 >> www.uvfilms.co.uk >> >> >> >> >> >> >> On 31 Aug 2012, at 13:47, Schneider, Abraham wrote: >> >>> And an additional question: >>> >>> is there a way to go from the old style Nuke linear colorspace to the ACES >>> colorspace? Both linear of course, but at least the RGB chromaticities are >>> different, whitepoint as well? >>> >>> Of course, it would only be possible to go from Nuke linear to ACES without >>> a loss, not the other way around because of the different gammut. >>> >>> Thanks, Abraham >>> >>> >>> >>> Am 31.08.2012 um 11:13 schrieb Schneider, Abraham: >>> >>>> 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 [email protected] >>>> 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 >>>> [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 >
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