Basically that's what you can do with a progressive jxl: the frame header includes a table of contents that can be used to infer the byte ranges needed for a pr

Basically that's what you can do with a progressive jxl: the frame header includes a table of contents that can be used to infer the byte ranges needed for a progressive preview corresponding to 1:8, 1:4, 1:2, and 1:1 resolutions.