ACES Core Transforms
September 1, 2026 ยท View on GitHub
This repository houses core CTL library functions used by the ACES system. These functions provide the foundational building blocks upon which higher-level ACES transforms are constructed, including:
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Rendering algorithms used in ACES Output Transforms (e.g., tonescale, chroma compress, gamut compress)
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Utility functions for common operations (e.g., clamping, matrix math)
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Fundamental color science operations (e.g., transfer functions, matrix conversions, chromatic adaptation)
Important
This repository was named aces-dev in versions of ACES prior to the 2.0
release, and preserves the commit history for those earlier ACES versions.
Use the tag history to access specific
ACES versions from before v2.0.
Contributing
Before the project can accept any code submissions through GitHub, you must fulfill these prerequisites:
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Contributor License Agreement (CLA): All contributors must have a signed CLA on file to ensure the project can freely use your contributions.
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Developer Certificate of Origin (DCO): All commits must be signed off (e.g.,
git commit -s) to verify that you have the right to submit the code. -
AI Assistance Disclosure: While not currently blocked by CI checks, any commits or PRs built with AI assistance are expected to include an
Assisted-by: TOOL/MODELline to maintain transparency and human accountability.
Please see Contributing Guidelines for more details.
Reporting Issues
General Issues
To report a problem with any transforms in ACES core, please open an issue in this repository.
Security
If the issue is sensitive in nature or a security related issue, please do not report in the issue tracker. Instead refer to SECURITY for more information about the project security policy.
Governance
This repository is part of ACES, a project governed by the Academy Software Foundation.
For details about how the ACES project operates, please see GOVERNANCE.
License
The ACES Project is licensed under the Apache 2.0 license.