> A giant hack which works very poorly.

Indeed. I tried every possible export format from Adobe Lightroom including JPG + HDR gainmaps, and it looks... potato.

With a narrow gamut like sRGB it looks only slightly better than JPG, but with a wider gamut you get terrible posterization. People's faces turn grey and green and blue skies get bands across them.

Meanwhile my iPhone creates flawless 10-bit Dolby Vision video with the press of a button that I can share with anyone without it turning into a garbled mess.

Just last week I checked up on the "state of the art" for HDR still image sharing with Gemini Deep Research and after ten minutes of trawling through obscure forum posts it came back with a blunt "No".

We've figured out how to make machines think, but not how to exchange pictures in the quality that my 12-year-old DSLR is capable of capturing!

... unless I make a YouTube video with the images. That -- and only that -- works!