Ultra HDR can have two jpegs inside, one for the usual image and another for the gain-map. Hypothetically, both jpegs can be created with jpegli. Hypothetical

Ultra HDR can have two jpegs inside, one for the usual image and another for the gain-map. Hypothetically, both jpegs can be created with jpegli. Hypothetically, both Ultra HDR jpegs can be decoded with jpegli. In theory jpegli would remove the 8 bit striping that would otherwise be present in Ultra HDR. I am not aware of jpegli-based Ultra HDR implementations. A personal preference for me would be a single Jpegli JPEG and very fast great local tone mapping (HDR source, tone mapping to SDR). Some industry experts are excited about Ultra HDR, but I consider it is likely too complicated to get right in editing software and automated image processing pipelines.