Thanks Robin. The FlyCap2 viewer has been updated since I used it a couple of years ago. Maybe you too have an older version. Downloading the current version is slightly bizarre - click on the FlyCapture SDK download at
https://www.flir.com/support-center/iis ... -download/ then open the folders and download only FlyCapture2/Windows/FlyCap2Viewer...x86.exe The restricted ROI works in FlyCap2 viewer, but when the ROI is set in FlyCap2, SharpCap will no longer open the camera. No problem. I wouldn't want to do it that way anyway. But ROI in SharpCap would be useful.
Concerning the Digital Processing, I was wrong. Both ON and OFF states are correctly reloaded with a SharpCap restart. But when it is switched off, there is no option to switch it on again. Unless I change the Colour Space eg from Mono16 to Mono8 and then Digital Processing is automatically turned on again. Again this is not a big problem.