Oh, not a criticism, Mark - I've just spent weeks sorting a 'new to me' scanner at something approaching a sane price. I just wondered if it was a process issue but looking closer it does appear to be a scanner problem.
I guess that scanning in greyscale will hide it a little (and reduce the image storage size somewhat) but it's possible it's an issue with the scanner calibration. For platten scans most scanners have a concealed white strip under the top edge of glass, and that bit is scanned first to calibrate the sensor's differing sensitivity between cells. It's possible that there's some discolouration on there for some reason. Easy to check *if* you're handy and confident with dismantling electronics, but not recommended otherwise.
Neil
Bookmarks