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Which the post clearly states and is, as far as I can tell, because Windows and DirectX is the only platform that supports it.

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That's not true; OpenGL, Vulkan and Metal also support HDR.

With currently shipping hardware and drivers? I know OpenGL can render HDR internally, but can you send that to a HDR-capable device today?

It just doesn't exist yet. There is a possibility that AMD might start supporting HDR this year. Intel is working on it. Nvidia hasn't gotten much further than https://www.x.org/wiki/Events/XDC2016/Program/xdc-2016-hdr.p... . It'll come, but we're not there yet.

Mind, even on Windows, it's pretty messy and you have to do a lot of figuring out and hacking platform layers to make it work.

not yet on linux sadly. Note that Krita works fine on linux - it comes from the KDE world anyways.

And it is shipped as an AppImage, so you don't need to wait for it to get into your package repo or deal with a lot of dependency nonsense.

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