The dad’s photo in the end in SDR looks so much better on a typical desktop IPS panel (Windows 11). The HDR photo looks like the brightness is smushed in the most awful way. On an iPhone, the HDR photo is excellent and the others look muted.

I wonder if there’s an issue in Windows tonemapping or HDR->SDR pipeline, because perceptually the HDR image is really off.

It’s more off than if I took an SDR picture of my iPhone showing the HDR image and showed that SDR picture on the said Windows machine with an IPS panel. Which tells me that the manual HDR->SDR “pipeline” I just described is better.

I think Windows showing HDR content on a non-HDR display should just pick an SDR-sized section of that long dynamic range and show it normally. Without trying to remap the entire large range to a smaller one. Or it should do some other perceptual improvements.

Then again, I know professionally that Windows HDR is complicated and hard to tame. So I’m not really sure the context of remapping as they do, maybe it’s the only way in some contingency/rare scenario.