agx module development

[Peyton_Creery]

I started to play around with implementing the AgX tonemapper.

The origin of this comes from GitHub - sobotka/AgX: There Be Kraken and Dragons but AgX seems to be finding it way into a lot of engines.

Below is my comparison.
Image comes from Experimenting with ICC Preference Profile and working profile...

filmcurv with hsl

filmcurv with ucs

filmcurve with agx (default weibull curve)

agx (allenwp tonemapping)

[Peyton_Creery]

Sweep_sRGB_Linear_Half_Zip.exr

input → colour → filmcurv → display
bump up the saturation to 1.4
matrix: rec709

[paperdigits (Mica)]

@Peyton_Creery

I started to play around with implementing the AgX tonemapper

Amazing!

[hanatos (jo)]

really cool these test chart exr, what am i looking at? i mean what are the settings for the individual images?

[hanatos (jo)]

this seems to be mostly an exercise in highlight reconstruction:

[Peyton_Creery]

I think a lot of the reasoning and history can be found here

There are several discussions happening around AgX tonemapping and I wanted to see what it was all about.

• AgX, Color Shifts, and The Notorious 6 in Darktable - Avid Andrew
• OCIO, Display Transforms and Misconceptions - Chris Brejon
• kofa’s inplementation of AgX in darktable
  • Blender AgX in darktable (proof of concept)
  • darktable/src/iop/agx.c at master · darktable-org/darktable · GitHub

[kofa (István Kovács)]

Thanks for that first link.

[hanatos (jo)]

agx colour preservation is now pushed as an option in the filmcurv module. thanks @Peyton_Creery !