Chaos Corona for 3ds Max > [Max] Feature Requests

CIE - option to apply LUT without hidden gamma transforms.

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piotrus3333:
This would make things so much easier for everybody:

Avi:
Hi Marcin,

Can you share some use case to have the lut work in linear as compared to sRGB?

maru:
Just to understand this better:
The result of applying a LUT in "Work in linear" vs "Work in sRGB" mode would be just a different appearance of the final output?

piotrus3333:
use case: to use a lut file as it is intended to be used. lut takes a given number and converts it to a different number. it should be straightforward like that.

VRay's work in linear option is how luts work in every software imaginable. it is the default behaviour. everywhere. work in log and work in srgb options are added just to simplify things, so one can use just one lut instead of two.

what Corona does: it applies hidden gamma transform just before the lut and inverse gamma transform just after. so the lut is getting incorrect input.

why: well, long time ago somebody thought that Corona users were not able to grasp the difference between linear and gamma. user could apply the lut on raw (linear) render in Corona's vfb, save the raw render to a jpg (gamma corrected) and than in Photoshop open said jpg, apply the same lut and get the same result. obviously without realising that it should not give the same result - as the view transform in Corona's vfb is also hidden.

tldr: what I'm asking for is: Corona, please be professional.

maru:
Thanks. The main reason why I was asking about the difference is that we treat LUTs in the VFB "just" as an effect to change the mood of the rendered image. Sorry for the unprofessional comparison, but pretty much like Instagram filters. That's why it should not really matter whether a LUT is applied one way or another. We have not received many reports like this, which of course does not mean that our LUT implementation is perfect, but we can assume it is generally accepted.
In case a user needs to perform some more advanced tasks using LUTs, they will probably save the output separately and open it in specialized software.

How I understand your request is that you would like to have the ability to use LUTs in a more technically correct way directly in the Corona VFB so that you don't have to use additional software. Is that right?

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