As color management is all about color spaces and gamuts, and high dynamic range (HDR) is also very much about color spaces and gamuts plus extended luminance range, Sebastian and I decided that Wayland color management extension should cater for both from the beginning. To help us keep focused and explain to the community about what we actually intend with Wayland color management and HDR support, I wrote the section "Wayland Color Management and HDR Design Goals" in color.rst (draft). A solution is to run your monitor in HDR mode all the time, and have the window system compositor convert all SDR application windows appropriately to the HDR luminance, so that they look normal in spite of the HDR mode.