Which graphics APIs texture formats are HDR texture formats?
Also consider these alternatives for reducing bandwidth in comparison to R16G16B16A16.

DXGI_FORMAT_BC6H_UF16 is block compressed fp16 (half) RGB.


  https://docs.microsoft.com/en-us/windows/desktop/direct3d11/bc6h-format


DXGI_FORMAT_R11G11B10 unsigned small float


  https://bartwronski.com/2017/04/02/small-float-formats-r11g11b10f-precision/


Common image file formats for HDR are exrs or dds. They're pretty trivially encoded as 32-bit or 16-bit per channel floats.