All of this in true-linear (gamma 1.0) The negative itself is neither logarithmic nor linear, those are just different ways to represent it digitally. If you want to emulate this, you need to invert, then mult. It’s done either automatically or manually, until the negative base has a Cineon code value of 95/1023. I’m a compositor by trade, so I only ever get to see scans already handled by the lab - my knowledge gap is what happens between the developed negative and the dpx/exrs that arrive ready for me to comp - I’d love to hear anyone’s experience on In Cineon scans, the removal of the orange cast is done on the light setup of the scanner, by either adjusting the R, G, B lights (if the scanner has that) or by adjusting the linear gain of the sensor in R, G, B (if the light color can’t be changed). celluloid) images, right? To approximate cineon scans, should I gamma-convert my scanner’s Linear Tiffs to srgb, cineon, or leave as linear?Ĥ - Are cineon lab scans just a matter of neutralising the black base and offsetting it to something like 95 value, and the highlights fall where they fall - or is there some kind of scaling of the whitepoint too, to a specific value?
RAWTHERAPEE CONVERT NEGATIVE MANUAL
My questions are about the correct way to generate cineon scans (ish) at home with my hardware, the neg inversion, and general order of operations:ġ - At which point should I invert the neg? Before or after any neutralisation of the film base colour cast?Ģ - How should I correct the negative or positive to remove the cast from the base/mask - mathematically subtract a sampled solid colour for example of the unexposed film between perfs from the entire image, or by grading manual channel offsets with dials? If so, do I want do this in linear or log?Ģb - If by hand, what are the correct correction tools (again to approximate traditional cinema workflow & cineon scans) - individual channel offsets, printer lights on the positive log scan, CST in and out of linear and correct with linear mults or rec709 gain dials etc.ģ - I’m essentially dealing with linear images of logarithmic (i.e. It can scan ‘raw’ dng files which I believe are some kind of linear tiffs in srgb primaries. My scanner is an okay-ish 35mm stills scanner: Opticfilm 8100, nothing high end, but perfectly fine for my purposes so far.
RAWTHERAPEE CONVERT NEGATIVE MOVIE
I’m starting a little project that involves scanning colour negative 35mm film stills stocks (Kodak portra 400, Fuji 400h etc), and roughly mimicking a movie workflow of cineon scan -> grade -> Print emulation LUT, rather than just getting regular srgb scans from a stills lab.
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