thanks really appreciate it I can’t send a pic unfortunately - just signed the NDA etc etc…..
thanks for the snippet - yes they have exactly the same effect - negative numbers in super brights interestingly when i change the incoming primary to sRGB rather than AlexaV3LogC - i get rid of the negatives and the image looks about natural Which makes me think that there is defo something weird about the plate - like the tone mapping is correct but the colours are not…. Anyway - thanks for your help - ill stick with normal nuke for these shots - ACES is great if the plates are spun out properly me thinks. N Neil Rögnvaldr Scholes Director | VFX Supervisor www.neilscholes.com <http://www.neilscholes.com/> +44 (0) 7977 456 197 > On 28 Oct 2016, at 20:08, Haarm-Pieter Duiker <l...@duikerresearch.com> wrote: > > Here's a little script to compare the default Nuke colorspace result and the > OCIO config result. Looks pretty similar... > > HP > > set cut_paste_input [stack 0] > version 10.0 v1 > Constant { > inputs 0 > channels rgb > format "1024 1024 0 0 1024 1024 1 square_1K" > name Constant1 > selected true > xpos 1519 > ypos 280 > } > Expression { > expr0 x/(width-1) > expr1 x/(width-1) > expr2 x/(width-1) > name Expression1 > selected true > xpos 1519 > ypos 352 > } > Dot { > name Dot1 > label "LogC data" > selected true > xpos 1553 > ypos 400 > } > set N4d458970 [stack 0] > OCIOColorSpace { > in_colorspace "Input/ARRI/Input - ARRI - V3 LogC (EI800) - Wide Gamut" > out_colorspace "ACES/ACES - ACEScg" > name OCIOColorSpace1 > selected true > xpos 1445 > ypos 438 > } > push $N4d458970 > Colorspace { > colorspace_in AlexaV3LogC > primary_in AlexaV3LogC > name Colorspace1 > selected true > xpos 1577 > ypos 438 > } > > > > > > On Fri, Oct 28, 2016 at 11:18 AM, Neil Scholes <n...@uvfilms.co.uk > <mailto:n...@uvfilms.co.uk>> wrote: > Hey yes I do have raw checked…. double checked…… > > crazy negative values > > weird one > > I’m having to resort to standard nuke and use the basic colorspace node to > convert from Arri LogC - shame really as i’d prefer ACES. > > I think its either a bug or the plate. > > > > Neil Rögnvaldr Scholes > > Director | VFX Supervisor > > www.neilscholes.com <http://www.neilscholes.com/> > > +44 (0) 7977 456 197 <tel:%2B44%20%280%29%207977%20456%20197> >> On 28 Oct 2016, at 18:38, Haarm-Pieter Duiker <l...@duikerresearch.com >> <mailto:l...@duikerresearch.com>> wrote: >> >> Hey, >> >> Do you have 'raw data' checked on the read node? If you don't, Nuke apply >> it's own linearization when the data is read in, at which point the data >> flowing through the graph is no longer LogC encoded. >> >> Not checking that box could lead to problems like you're describing. >> >> HP >> >> >> >> On Friday, October 28, 2016, Neil Scholes <n...@uvfilms.co.uk >> <mailto:n...@uvfilms.co.uk>> wrote: >> Hi >> >> So I’m looking at supposed ARRI LogC footage - dpx's >> >> In ACES (1.0.1) converting from ARRI V3 LogC (EI800) Wide Gamut to ACEScg >> gives me horrible negative values …..big ones >> >> So I’m wondering - is there a bug with ARRI V3 LogC and ACES currently?, >> or is it likely that the plate is not actually LogC ? >> >> Thanks for any pointers >> >> N >> >> >> >> Neil Rögnvaldr Scholes >> >> Director | VFX Supervisor >> >> www.neilscholes.com <http://www.neilscholes.com/> >> >> +44 (0) 7977 456 197 <tel:%2B44%20%280%29%207977%20456%20197> >> _______________________________________________ >> Nuke-users mailing list >> Nuke-users@support.thefoundry.co.uk >> <mailto:Nuke-users@support.thefoundry.co.uk>, >> http://forums.thefoundry.co.uk/ <http://forums.thefoundry.co.uk/> >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> <http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users> > > _______________________________________________ > Nuke-users mailing list > Nuke-users@support.thefoundry.co.uk > <mailto:Nuke-users@support.thefoundry.co.uk>, http://forums.thefoundry.co.uk/ > <http://forums.thefoundry.co.uk/> > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > <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
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