Process

aces-dev Discovery & Classification

The config generation process starts with a set of definitions and classes to discover, parse and classify the CTL transforms from aces-dev:

• opencolorio_config_aces.discover_aces_ctl_transforms()

• opencolorio_config_aces.classify_aces_ctl_transforms()

• opencolorio_config_aces.print_aces_taxonomy()

Note

This approach allowed us to improve the consistency of the CTL transforms ACEStransformID while fixing various filename issues.

Using ACES2065-1 as connection spaces, it is possible to build a colour conversion graph with all the high-level relevant transforms.

• opencolorio_config_aces.build_aces_conversion_graph()

• opencolorio_config_aces.plot_aces_conversion_graph()

An initial mapping of ACES AMF components is generated after the classification process. The mapping defines the ACEStransformID relationships. Its generation is automated but needs to be guided by an external file, i.e., opencolorio_config_aces/config/reference/discover/resources/ACES_AMF_Components.json, because a few relationships cannot be derived automatically.

Analytical & Reference Configs Generation

The colour conversion graph is then used to create the Analytical config that maps 1-to-1 the aces-dev CTL transforms to theoretical OpenColorIO builtin transforms. This config does not work but it is useful to test basic generation capabilities whilst diagnosing issues in the mapping.

The Reference config is driven by a CSV file generated from a spreadsheet mapping the ACEStransformID to OpenColorIO builtin transforms.

• opencolorio_config_aces.generate_config_aces()

CLF Transforms Generation, Discovery & Classification

The working group decided to express additional colour transforms using CLF. Some CLF transforms can be serialised into a config which reduces the need for external files. Each CLF transform has a CLFtransformID specified according to the CLF Formatting for ACES OCIO Config document.

The repository contains code to generate, discover and classify the additional CLF transforms that the CG and Studio configs require.

• opencolorio_config_aces.discover_clf_transforms()

• opencolorio_config_aces.classify_clf_transforms()

• opencolorio_config_aces.print_clf_taxonomy()

CG Config Generation

The CG config generator also uses a CSV file generated from a spreadsheet pivot table that expresses which ACEStransformID should be used from the Reference config and which CLFtransformID should be used from the shipped CLF transforms.

• opencolorio_config_aces.generate_config_cg()

The conversion process is as follows:

aces-dev Discovery & Classification -> Reference Config Generation -> CLF Transforms Generation, Discovery & Classification -> CG Config Generation

Studio Config Generation

The Studio config generator follows the same approach but uses a different pivot table of the spreadsheet.

• opencolorio_config_aces.generate_config_studio()

The conversion process is as follows:

aces-dev Discovery & Classification -> Reference Config Generation -> CLF Transforms Generation, Discovery & Classification -> Studio Config Generation

Config Versioning Rules

The following rules have been adopted to version up the config name colorspaces:

Major Version Increase	Minor Version Increase	Patch Version Increase
Remove Colorspace	Add Colorspace	Add Colorspace to inactive_colorspaces
Remove Look	Add Look	Add Look to inactive_colorspaces
Remove NamedTransform	Add NamedTransform	Add NamedTransform to inactive_colorspaces
Remove DisplayColorspace	Add DisplayColorspace	Add DisplayColorspace to inactive_colorspaces
Remove ViewTransform / SharedView	Add ViewTransform / SharedView
Remove Role	Add Role
Reassign Role
Change to Transform Processing Output		Fix Incorrect Transform Processing Output?
Remove alias from aliases	Add alias to aliases
Remove AMF component	Add AMF component
		Change to categories
		Change to encoding
		Change to family
		Change to Transform Description
		Change to Config Description
		Change to file_rules
		Change to viewing_rules
		Change to active_displays
		Change to active_views
		Change to inactive_colorspaces
		Reassign default_view_transform
Change luma?