My set of OpenColorIO tools and plugins. It currently contains plugins for Houdini and Maya, as well as a tiny Qt standalone application. Download a precompiled binary here.

OpenColorIO is a library developed by Sony Pictures Imageworks, where it is part of their OpenSource initiative amongst other libraries and frameworks like OIIO, Alembic and OSL to name few. OCIO aims to enable consistent color management across programs by providing a unified color environment. Central to this is the idea of .ocio files which define the working color environment, by specifying a set of LUTs that can be used. OCIO provides an interface to a variety of LUT formats, in much the same way as OIIO does to image formats. These LUTs are then used for colortransformation on the CPU or GPU. OCIO is increasingly used in commercial software like NUKE or MARI. here is a list of compatible software.

Since OCIO is a color management solution geared towards unifying the color management in an animation/vfx pipeline it makes sense for all tools in the pipeline to natively support it. Therefore the primary goal is to create a set of Houdini COP nodes (Houdinis compositing network) as equivalents to the NUKE OCIO nodes which ship natively. Additionaly i plan on developing a set of Maya nodes for color managing textures, to become familiar with the library. My personal interest in this project is to enhance my C++ programming and to become familiar with the Houdini Development Kit.

The list of nodes i want to make available as Houdini COP2 nodes

• OCIOCDLTransform Applies an ASC CDL (American Society of Cinematographers Color Decision List) grade based on the OpenColorIO Library
• OCIOColorSpace Apply a color transformation based on a .ocio file. Ocio files are yaml based and describe the complete available colorenvironment. The color environment in turn usualy consists of a dozen Lut files which describe transformations to/from the reference color space to the target space.
• OCIOFileTransform Accepts a path to a specific color lut file and does a color transformation based on it.
• OCIOLogConvert Do a color transformation from Lin to Log, or the other way round, based on the Lin and Log roles of the given .ocio config file.

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