HDR IMAGES WITH MULTIPLE COLOR GAMUTS

摘要

Image encoding and decoding are described. An input HDR image that includes a base image and a ratio image may be stored using two or more color description profiles. One profile defines the encoding color space of the base image and the second profile defines the encoding color space of the HDR metadata which may be different than the color space of the base image.

主权项

1. A method to encode with a processor a high dynamic range (HDR) image, the method comprising:
receiving an input HDR image (HDR) with an input color gamut and an input dynamic range; applying a tone mapping and a gamut mapping function to the input HDR image to generate a first base image in a first dynamic range and a first color space, wherein the first color space comprises a first color gamut, wherein the first dynamic range is lower than the input dynamic range and the first color gamut is narrower than the input color gamut; applying a color transform process to the first base image to generate a second base image in a second color space with a second color gamut, wherein the second color gamut is different than the first color gamut; generating HDR metadata in response to the input HDR image and the second base image; and generating an output coded HDR image based on the first base image and the HDR metadata.