Re: [Nuke-users] LogC through ACES.......?

Hey Lucien Agreed - theres something weird done to the plates that I’m unable to solve my end. I can reverse out everything neatly the way i have it - but its messy and i don’t want to cause problems down the road - I’ve settled to just using the standard colorspace node: in set to

[Nuke-users] LogC through ACES.......?

Hey Neil, the result you get from this srgb -> arri wide gamut are not surprising but I dont think they are appropriate in your case. If you are converting this plate with negative values from srgb to arri wide, you are essentially saying that the code value of your image which are negative

Re: [Nuke-users] LogC through ACES.......?

Hi Kevin Thanks for help ok so random frame on one of the pics… looking through OCIO node converting ARRI V3 LogC(EI800): log values 74 61 87 across rgb in lowest value….. and weirdly in superb rights - 0 0 1023 in highest value ……! - changing primaries from sRGB to AlexaV3LogC

Re: [Nuke-users] LogC through ACES.......?

On 31 October 2016 at 09:10, Neil Scholes wrote: > 1/ changing primaries from sRGB to AlexaV3LogC - get rid of a ton of > negatives ( values lower than -1) > I’m taking a guess here ( shares the same primaries as rec709) > white point still D65 This certainly sounds

Re: [Nuke-users] LogC through ACES.......?

Hi Guys Thanks very much for the input - very interesting The plates are 10it DPX I’m clicking RAW on the read node - so not changing any color then : 1/ changing primaries from sRGB to AlexaV3LogC - get rid of a ton of negatives ( values lower than -1) I’m taking a guess here ( shares the

Re: [Nuke-users] LogC through ACES.......?

What file format are the raw plates? Quicktime or Arriraw? How did you try to convert direct from Arri to ACEScg? IE which colorspaces did you use? On Sun, Oct 30, 2016 at 7:24 AM, Neil Scholes wrote: > Ok - so thanks for the tips - and the solution > > I’ve now got RAW

Re: [Nuke-users] LogC through ACES.......?

Ok - so thanks for the tips - and the solution I’ve now got RAW plates first going through a regular colorspace node - just changing primaries from sRGB to AlexaV3LogC Next an add to eliminate the tiniest negatives…. A final OCIO colorspace node going from ARRI V3 LogC (EI800) wide gamut - to

Re: [Nuke-users] LogC through ACES.......?

Thanks for that I'll check it out. That might be a solution. Strange though as the whole point of the IDT is to bring the footage into ACES without needing to offset etc. Yesterday I was also made aware that the plate may have peculiar primaries so I've got a few ideas now to try out Thanks

[Nuke-users] LogC through ACES.......?

Hey Neil, I had a similar problem than you on a show shot in Arri wide gamut. The first thing to notice is that Arri Wide gamut have very different primaries than Aces CG. In other words, some colors in Arri Wide gamut correspond to negative chromacities in Aces CG gamut. Besides this, the

Re: [Nuke-users] LogC through ACES.......?

hmmm - weird - ill have a look again with that in mind cheers Yeah its amazing to me how plates can get so messed around - worked on a job recently where everything was super underexposed and grainy to hell because of it. Half the job was spent making the picture half decent weird. N

Re: [Nuke-users] LogC through ACES.......?

I hate to even suggest it but could they have recorded Rec709 instead of LogC? Or perhaps someone rendered LogC to Rec709 between when it was shot and when it got to you. Either way, awkward. Sent from my iPhone On Oct 28, 2016, at 13:41, Neil Scholes

Re: [Nuke-users] LogC through ACES.......?

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

Re: [Nuke-users] LogC through ACES.......?

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

Re: [Nuke-users] LogC through ACES.......?

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 |

Re: [Nuke-users] LogC through ACES.......?

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,

[Nuke-users] LogC through ACES.......?

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