Color metadata for a downlink data channel

摘要

The present invention provides a method and system for determining and providing color metadata for a downlink data channel. In accordance with the present invention color metadata is determined such that gamut mapping is defined by a transmitted source gamut which enables adapted mapping that preserves saturation and contrast levels of the source for a downlink data channel. The metadata is then provided to a downlink data channel for color management.

主权项

1. A method for gamut mapping a color gamut of content of a source, comprising:
determining metadata describing said color gamut of content of a source; communicating said metadata to a data channel for use in said gamut mapping that preserves saturation and contrast levels of said source; and performing said gamut mapping based on a color space gamut defined using said color gamut of said source; wherein the color gamut of said source is defined by a set of vertices with indexed facets in a chosen color space; wherein a size, measured in bits, of gamut vertices and gamut facets fields of the color space gamut definition is characterized according to an equation, which follows:
S=3NVN+3NF┌ld(NV)┐, wherein, ┌*┐ depicts an operation that rounds to the next upper integer, Id depicts a logarithm to the base of 2, N represents color precision of the chosen color space, Nv represents a number of vertices, and NF represents a number of facets.