Thanks Don, the Image Restoration command does not exist in the monitor
software that the G410 monitors have but if I put a meter on the G2 output
it's loading does correct the picture brightness so I think the modification
you pointed out to me will work.
I will let you know how things work out in the end but I'm afraid that I
have been diverted on to more viable work at the moment.
Cheers for now John.