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I have tried to check the graphics options but I can't see any HDR settings there... do I need a specific graphics card? I have a GeForce GTX 1070.
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I think that Since patch 1.03 it should work by default if your computer (GPU, OS, Processor and monitor) supports HDR, but I have no confirmation on that.

EDIT: I just reinstalled the game. There actually is HDR setting on the graphics settings.
Check that the game is updated and that HDR is configured in Windows 10.
Post edited December 13, 2019 by Skeith
Pretty sure the 1070 does not support HDR--as it predates the GPUs that do. Basically, with AMD it's the RX-5000-series and newer that support it, and with nVidia it's the RTX-2000 series and newer that support HDR. Earlier cards do not.

Also, there is a 3d API option in D3d versions and elsewhere that has been around for a long time also called "hdr" unfortunately...;) High Dynamic Range in the old days does not mean what it means today...! Also, it's not just HDR hardware, but how well the game software supports HDR is a huge factor. Some HDR games look terrible--washed out, so bad you immediately want to turn HDR off. But some games do a fantastic job with HDR--RDR2 does a very good job with it, and so does No Man's Sky (latest patches and versions), but the best HDR I've ever seen in a game with my 5700XT is Baldur's Gate 3--at 4k HDR it is drop-dead gorgeous--it's my default for running the game--looks noticeably superior to the standard non-HDR display, imo.

just a quick message to add that a Geforce GTX1070 does actually support HDR. (Nvidia's cards have been supporting the mode ever sice the 900-series). I'm playing the game with that card myself.

You need to make sure you have set the game to 'true' Fullscreen-mode in order to activate the HDR-option and gain access to its settings.