Colours washed out and less brightness?

[JimKnopf]

You find this option at

OSMC GUI → Settings → System → Display → Force RGB output
(if you do not see it, you have to change the Settings Level on the bottom left to “expert”.

Unfortunately it might not work and will be fixed in the next OSMC update.
For so long take this workaround:

Low colour saturation Vero 4k

See Low colour saturation Vero 4k - #9 by tgrun Try putting it in /etc/rc.local before exit 0, or before setting anything permanently: Boot up Run sudo systemctl stop mediacenter Type sudo -s Run echo 1 > /sys/class/amhdmitx/amhdmitx0/output_rgb before playing anything Run sudo systemctl start mediacenter

So, the end of your /etc/rc.local should look like

...
# By default this script does nothing.
echo 1 > /sys/class/amhdmitx/amhdmitx0/output_rgb
exit 0