More importantly, the inexpensive Canoscan 9000F Mk II can be manipulated by SilverFast to increase its dynamic range from 1,379 greyscale values to 9,550, using SilverFast’s Multi-Exposure feature. […] You shouldn’t try to remove dust and scratches in Photoshop, but do it in SilverFast as the latter provides for a feature called iSRD. iSRD uses your Canoscan 9000F MK II’s infrared lamp to find dust and scratches and fix these automatically (and much faster than “ICE”, which you’ll find in some other scanners).