Can I use the gamma option under Service/installation? Can I use that option without wiping our the settings or results of the ISF grayscale tracking? Is is global or per timing/memory block? The reason I ask is that I recently switched TheaterTek to use the VMR9-renderless feature, which has improved chroma scaling and apparently gives faithfull video output levels, where the Overlay default is pc levels 0-255. I dropped the brightness appropriately and checked against Avia and Video Essentials2. My Barco was installed by Roland and re-calibrated a year later by Gordon. The colours and gamma are defintely off slightly now for some or all resolutions. I know the ideal is to get one of the guys in, but I'm looking at rebuilding the room soon, so would get the barco re-calibrated professionally after that. Your thoughts appreciated. cheers, Rob.