IEC 61966-12-1:2011

Overview

IEC 61966-12-1:2011 - also known as Gamut ID - specifies a standardized colour gamut metadata scheme for multimedia systems and equipment. The standard defines how to describe the colour gamut of video content or of a display device so that controlled and predictable colour reproduction can be achieved across heterogeneous systems (wide-gamut video, HDR displays, projectors, etc.). IEC 61966-12-1 defines metadata profiles (full, medium, simple), the logical structure of gamut descriptions, and optional colour-encoding information when the encoding specification does not provide it.

Key Topics

• Gamut ID metadata scheme: A formal structure to identify and describe a colour gamut associated with content or a display.
• Profiles for scalability: Full, medium and simple profiles allow trade-offs between precision and implementation complexity (professional vs consumer use).
• Gamut geometry description: Definitions for vertices, faces, gamut hulls and components; includes mechanisms for packing coordinates and indices for efficient metadata storage.
• Header and metadata structure: Standardized headers for Gamut ID and for the description of gamut geometry to enable interoperable parsing.
• Colour reproduction information: Metadata fields to carry additional colour encoding and reproduction requirements when not present in the colour encoding specification.
• Implementation scope: The standard defines the metadata format only - vendor-specific creation and end-use workflows are permitted.

Applications

• Ensuring accurate colour mapping when playing wide-gamut content on displays with different gamuts.
• Enabling content creators (post-production, digital cinema) to embed the target gamut so displays can perform controlled rendering and gamut mapping.
• Allowing display manufacturers to publish device gamut metadata so creative tools can optimize content for specific devices during mastering.
• Supporting broadcast, streaming and media workflows that must manage multiple display types and preserve appearance across platforms.

Who Uses This Standard

• Colour scientists and imaging engineers
• Display manufacturers and hardware vendors
• Video codec and metadata tool developers
• Post-production studios, digital cinema and broadcast engineers
• System integrators and platform providers managing wide-gamut/HDR distribution

Related Standards

• IEC 61966-2-4 (xvYCC) - wide-gamut video colour encoding
• ITU-R BT.709 and ITU-R BT.601 - legacy video colour gamuts and workflows
• Other parts of IEC 61966 series on multimedia colour measurement and management

IEC 61966-12-1:2011 is a practical, interoperable foundation for describing and exchanging colour gamut metadata, enabling consistent colour appearance across increasingly diverse video and display ecosystems.