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 and placing before OCIO conversion blacks 73 67 84 superbrights 763 828 1023 seems better to me….average blacks sit around 095 ———————— > As to sRGB/709 primaries these are usually easy to spot as a simple > LogC -> linear followed by a 2.2-2.4 gamma curve on a monitor with > those primaries makes a reasonable looking image give or take Sticking that gamma curve does exactly what you say - pleasing image……… :) interesting Im pretty convinced something has happened to the plate before reaching me N Neil Rögnvaldr Scholes Director | VFX Supervisor www.neilscholes.com <http://www.neilscholes.com/> +44 (0) 7977 456 197 > On 31 Oct 2016, at 09:19, Kevin Wheatley <kevin.wheat...@framestore.com> > wrote: > > On 31 October 2016 at 09:10, Neil Scholes <n...@uvfilms.co.uk> 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 non-standard, before converting what are the > minimum/maximum values in the files? > > Like Joseph says the average 'full' black should be around 95 > similarly there are limits on where the peak whites end up, I've seen > cases where ARRI Log C files have been graded prior to coming to me > that results in more problems than when they were left as is. > > As to sRGB/709 primaries these are usually easy to spot as a simple > LogC -> linear followed by a 2.2-2.4 gamma curve on a monitor with > those primaries makes a reasonable looking image give or take > highlight clipping - though that can depend on there being something > in the scene that is a memory colour (skin, ColorChecker chart, etc) > > Kevin > > -- > *Framestore* | Kevin Wheatley | Head of Imaging > *London* - New York - Los Angeles - Montreal > > 19-23 Wells Street, London, W1T 3PQ > T: +44 (0) 20 7344 8000 > > framestore.com <http://www.framestore.com/> > Facebook <https://www.facebook.com/Framestore> > Twitter <http://twitter.com/Framestore> > _______________________________________________ > 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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