Possible issue in negadoctor

Is there an existing issue for this?

• I checked and did not find my issue in the already reported ones

Describe the bug

The linear to cineon log formula in the Cineon white paper is incorrect
https://github.com/NatronGitHub/openfx-misc/issues/76

incorrect cineon = (log10((v + offset) /gain)/ (0.002 / gamma) + whitepoint)/1023

correct cineon = (log10(v/gain + offset )/ (0.002 / gamma) + whitepoint)/1023
Negadoctor is based on cineon conversion so it could be incorrect too.

Steps to reproduce

.

Expected behavior

No response

Logfile | Screenshot | Screencast

No response

Commit

No response

Where did you obtain darktable from?

darktable.org / GitHub release

darktable version

5.4.0

What OS are you using?

Linux

What is the version of your OS?

Windows

Describe your system

No response

Are you using OpenCL GPU in darktable?

None

If yes, what is the GPU card and driver?

No response

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

No response

Start with the negadoctor implementation and compare its linear-to-Cineon conversion with the formula in the linked Cineon reference and openfx-misc issue #76. Trace how the conversion is used and determine whether the reported parenthesization applies. Done means the issue is confirmed or ruled out with a reproducible result.