Support for Common LUT Format in Colour available!

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We are happy to announce the release of Colour - CLF IO. This extension package for Colour implements reading and writing files in the Common LUT Format (CLF), as well as using Colour to execute workflows defined in CLF.

What is CLF?

One common way of transforming and communicating colours are Look-Up tables (LUTs) that provide a one-to-one mapping between an input and output colour. In recent years, a new format for storing and exchanging LUTs has emerged: the Common LUT Format (CLF). This format provides (1) a flexible way to describe colour transformations through LUTs, (2) supports describing more complex colour transformations through combinations of LUTs and mathematical functions, and (3) provides standard ways to provide metadata and comments to the colour transformations. This makes it an ideal format for storing and exchanging annotated colour transformations. The format itself is well described by a standard released as part of the Academy Color Encoding System.

CLF is an XML-based format that describes a transformation of input colours to output colours. It contains a ProcessList that consists of ProcessNodes that describes a certain transformation, for example, the application of a LUT, or some other mathematical transformation. Each ProcessNodes is described in the standard and has a number of parameters that specify its behaviour. The overall transformation is thus described through the sequential application of all ProcessNodes in the ProcessList. Furthermore, CLF provides facilities for storing metadata about the ProcessList and each ProcessNode, e.g., comments, descriptions of the expected input and output. This metadata allows CLF to contain rich information and descriptions of the colour transformation described within it.

Features

The Colour - CLF IO package allows

  • Reading CLF 3.0 files to a Python representation.

  • Writing CLF files from the Python representation. Supporting both CLF 3.0 and the upcoming SMPTE ST 2136-1 standard.

  • Executing CLF workflows and applying them to colours or images.

More Information

Visit the Colour - CLF IO repository for more information, usage examples and tutorials.

Funding

We would like to thank NumFOCUS for funding the work on this package through the The Small Development Grants program.

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