What Is OpenColorIO?

OpenColorIO (OCIO) is an open-source color management solution built for motion picture production, with a focus on visual effects and computer animation. It gives studios, artists, and developers a single framework for defining, transforming, and applying color across an entire pipeline — from on-set footage through compositing, rendering, and final delivery. If you work in film, episodic, or animation and need consistent color from one application to the next, OCIO is the layer that makes that possible.

What OCIO actually does

Color management is the problem of making sure a pixel that looks red in one tool still looks the same red in the next tool, on a different display, under a different viewing transform. OCIO solves this by separating color decisions from the applications themselves.

Instead of each piece of software inventing its own color handling, OCIO provides:

• A configuration (config) that describes the color spaces, displays, views, and transforms available in a project.
• A processing engine that applies those transforms consistently.
• APIs so applications and pipeline tools can query and apply the same config.

The result is that a config authored once can drive color behavior across every OCIO-aware application in a facility.

Who it's for

The project organizes its audience into three groups, and the entry point differs for each:

Where OCIO is already integrated

OCIO ships inside a wide range of production tools, so in many cases you don't install it separately — you just use the color management features the application exposes. The supported applications list spans 2D, 3D, animation, compositing, editing, game engines, lighting, look dev, and more. Examples from the official list include:

• Compositing / finishing: Nuke, Autodesk Flame (2026 and up), Hiero, DJV, mrViewer
• 3D / animation: Autodesk Maya (2016 and up), Autodesk 3ds Max (2024 and up), Blender (2.64 and up), Houdini (16 and up), Katana, Modo
• Rendering: Autodesk Arnold, Guerilla Render (2.2 and up), Clarisse
• Editing / review: Adobe After Effects (native support), cineSync, Mocha Pro (2020 and up)
• Game engines: CryEngine (3 and up)
• Painting / texture: Krita (2.6 and up), Mari (1.4 and up)
• Other: Gaffer, Anchorpoint, AJA ColorBox, Disguise Designer (r29.1 and up)

Because integration is native in most of these, the practical question is usually not "does this tool support OCIO?" but "which config and which views should this project use?"

What's new in OCIO v2.5.0

The current release adds several capabilities that matter for pipeline work:

• Config Merging (Preview): lets users and applications control how configs combine — resolving name and alias conflicts, color space duplication, and similar issues. It's in preview, so the project is actively asking for feedback on use cases and workflows.
• Vulkan GPU support: OCIO's GPU renderer can now be used in applications built on the Khronos Vulkan graphics API, for newer GPU hardware.
• Full ACES 2.0 support: with ACES 2.0 built-in configs included, ACES 2.0 support is feature complete, and ACES 2.0 Output Transforms can be used as OCIO views.
• New color space attributes: support for the Color Interop ID from the Color Interop Forum, plus attributes for ICC and AMF.

If you're already running OCIO v2, the upgrade guides cover the migration path.

How to decide whether you need to learn OCIO directly

You don't always need to. Use this as a rough filter:

• You're an artist in a supported app: Start with your application's color management settings. OCIO is working underneath; you mostly need to understand which config and view you're selecting.
• You're building or maintaining a pipeline: Learn the config structure and the Python API. This is where OCIO's value compounds, because one config can govern many tools.
• You're writing an application or plugin: Go to the Software Developer Guide, especially if you're new to color management frameworks or moving to v2.
• You only need a one-off conversion: A full OCIO setup may be more than you need; check whether your existing tool already exposes the transform.

Getting started

The project's own navigation points to the main entry points: Get Started, Documentation, Downloads, and Github. For artists, the fastest path is the Supported Applications page to confirm your tool's integration and version. For studios and developers, the Python API and Software Developer Guide are the substantive references.

One practical note: version requirements vary by application (for example, Maya 2016 and up, Blender 2.64 and up, Flame 2026 and up), so confirm your tool's minimum version before assuming a given OCIO feature is available.