Do you think it would be sensible to blank the screen AFTER initialisation but before any measurements are made? I was thinking on something like:
It's not straightforward, because whether the whole screen is to be blanked or not changes the way the test window is created, and yet the user needs the window up to guide where to put the device on the screen. I'll have a think about it, and see if there is a way of arranging it. You may still have a problem though, if there is an error of some sort. [ When I added this feature to support calibrating projectors, I was assured that there was "no problem, because the command window will be on another screen" :-) ] Graeme Gill.