Content-Dependent Metadata for Color Volume Transformation of High Luminance and Wide Color Gamut Images

摘要

When displaying High Dynamic Range (HDR) or Wide Color Gamut (WCG) content on displays with smaller color volumes, such as High-Definition TV (HDTV), a color conversion from HDR or WCG to Standard Dynamic Range (SDR) is required. To maintain the creative intent, this color conversion needs to take into account the characteristics of both the content and the target display. As the content characteristics change from scene to scene, the optimal conversion will change as well. For example, a very dark scene will be mapped differently from a very bright scene when converting from a large color volume to a more restricted color volume. The converter(s) can be represented as metadata synced with the frames of the original stream. The metadata can be created in the mastering process, when images are creatively approved, and later applied in media conversions deferred to the distribution stage. This presentation discusses how such metadata can be captured and carried.