All photos
Yevhenii Dubrovskyi
a lake in the middle of a mountain range
Photo by Yevhenii Dubrovskyi on Unsplash · Original
Drag the seam — left of it is the SDR base (dynamic-range-limit: standard), right of it is the same JPEG decoded as an Ultra HDR gain map. Both use local long-edge-capped JPEGs so resolution and codec match exactly.