Openmedia video settings

[rebus]

Does anyone know any way of altering the openmedia video (brightness/contrast/colour) setting.
My picture is good via scart but is not quite right.
The whites seem a little too powerful compared to my freeview box.
Anyone else not 100% happy with the picture quality?

[westkill]

is the av settings on the box set to rgb
or adjust some settings on the tv