Arri LogC4 ACES IDT

Arri LogC4 IDT for Davinci Resolve, Baselight & OCIO

Based on https://www.arri.com/resource/blob/278790/bea879ac0d041a925bed27a096ab3ec2/2022-05-arri-logc4-specification-data.pdf

by Jimmy Zhu, www.jimmyzhu.net

For a more detailed installation and usage guide, please check out the blog post: https://www.jimmyzhu.net/blog/arri-logc4-aces-idt-220629

Davinci Resolve:

• Navigate to the "ACES Transforms" folder in Resolve's main application support folder.
  • MacOS: "~/Library/Application Support/Blackmagic Design/DaVinci Resolve/ACES Transforms" double check folders again
  • Windows: "%AppData%\Blackmagic Design\DaVinci Resolve\Support\ACES Transforms"
  • Linux: "~/.local/share/DaVinciResolve/ACES Transforms"
• Place Arri_LogC4.dctl in the IDT subfolder.
• Start Resolve.
• At start up, Resolve loads all the ACES DCTLs inside the "ACES Transforms/IDT" and "ACES Transforms/ODT" folders.
• Arri LogC4 is now available as the ACES Input Transform in the project color management setting.
• Arri LogC4 is also available in the drop-down menu if you prefer a node tree based ACES workflow.

Baselight:

• Navigate to the "colourspaces" folder for colour space transform files.
  • MacOS: "~/Library/Application Support/FilmLight/etc/colourspaces"
  • Linux: "/usr/fl/etc/colourspaces"
• Place ARRI_LogC4_WG4_full.flspace in the "colourspaces" folder.
• Start Baselight.
• ARRI: LogC4 / Wide Gamut4 is available for Colour Space Input.

OCIO:

• This config only contains the code for ARRI LogC4. If you don't have a full ACES OCIO config, you can download the latest ACES 1.2 OpenColorIO configuration files
• Copy the code from Arri_LogC4-config.ocio into the full ACES config.ocio file.
• Copy V4_LogC_800_to_linear.spi1d into the "luts" folder.
• Load the modified OCIO config in DCC applications.
• Input - ARRI - V4 LogC (EI800) - Wide Gamut is now available in OCIO.