Hello BartKrap,
The colour picker allows you to pick a colour which can be used in show control.
To use it you must first add a source Touch Screen. Then you have the option to add actions. Add an action with the type colour picker 8 or 16.
Now you can edit the action. In the edit window you can add a task DMX -> RGB -> Control. This task will take the selected colour and translate it into DMX channels. Param1 has to be set to the DMX channel which controls the red of a fixture. Green and blue are placed on the channels thereafter.
Best regards,
Guido