When taking screenshots with the screenshot maker the colors in the resulting file are not identical to the colors in the 3D view. The annoying part is that the colors in the generated file are greyed our and much less vibrant :-/
This was done with the screenshot maker
{F2459950}
This was taken as a simple (actual) screenshot with the builtin Ubuntu tool
{F2459952}
You can quite clearly see the difference.
Ubuntu 18.04 with 2021-10-01 snapshot