Dull colors in 4K on RPI4

  • Good morning

    I'm on libreelec 11.0.1 via an RPI4 and a 1080p video projector

    When I display a source in 4K the image seems perfectly sharp but the colors are bland, even slightly greyed out. (no problem un 1080p source)

    I tried quite a few options to try and fix this but nothing worked. I remember a few years ago not having this problem with earlier versions.

    Does anyone have a solution?