S-Log3 Venice S-Gamut3.Cine

Flame Flame Questions
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1

@doug-walker
What version of ACES is in the current release of Flame 2025?
Still 1.1?

We have a job that needs this IDT - S-Log3 Venice S-Gamut3.Cine

It stumped us for a while beacuse we have S-Log3 S-Gamut3.Cine but there is some subtle shift particularly in green from S-Log3 Venice S-Gamut3.Cine

Is there some way that we can load a new IDT :thinking:

I really need to find a solve for this problem since we need to deliver ACEScg from Sony Log footage.

2

In 2025.1 there seems to be a Venice IDT

image
image728×169 60.6 KB

If that doesn’t work, I’m quite certain if you have the right matrix coefficients you can go into the SynColor folder copy the old Slog3 IDT and update it.

The original file SLog3-SGamut3_to_ACES.ctf is located at /Applications/Synergy/SynColor/2019.1/transforms/camera/Sony on a Mac (or accordingly on Linux).

It’s an XML file describing the color space translation and includes a 1D LUT for the gamma conversion.

You sould be able to find the correct values for Venice either on the Sony website, or on the ACES GitHub page here: Sony Venice Input Transform

I think these values are the magic causing your green issue:

const Chromaticities SONY_VENICE_SGAMUT3_CINE_PRI =
{
{0.775901871567345, 0.274502392854799},
{0.188682902773355, 0.828684937020288},
{0.101337382499301, -0.089187517306263},
{0.312700000000000, 0.329000000000000}};

vs.

const Chromaticities SONY_SGAMUT3_CINE_PRI =
{
{0.766, 0.275},
{0.225, 0.800},
{0.089, -0.087},
{0.3127, 0.3290}};

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3

Thanks @allklier

Just booted up a machine we have been testing 2025.1 on and we do have this :sweat_smile:

Flame2025_Venice
Flame2025_Venice1554×518 119 KB

I guess now is the time to upgrade :hugs:

2 Likes
4

This is a little scary and might require more testing. Helpful but I think doing the Flame upgrade is a much simpler process. Thanks again @allklier

5

I have this on 2024. It might not solve your problem. You should test it first.

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