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.
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.