To check the scanner’s depth resolution I put a few pens on the scanner’s glass and scanned them. Here’s the result:
A high depth resolution helps get fine scans of the centerfold of a book which is necessary for correct operation of OCR programs.
Next I scanned a standard 10x15cm photograph in three modes: Auto Exposure, ICM and Auto Exposure with enabled Color Restoration.
As you can see, the best result is achieved when you use the native ICM profile. Color Restoration technology intensified the B channel and result in a distortion of the original colors.
The Perfection 4490 doesn’t allow the user to choose any dust removal technology when a reflective original is digitized; Digital ICE and Dust Removal remain inactive in the driver window in this case.
I liked how Digital ICE for Prints worked in the top-model Perfection 4990 and I don’t quite understand why it is missing in the Perfection 4490. I think this makes the scanner less appealing for the customer. If you compare Epson’s scanners with Canon’s CanoScan series, which are their main competitors in my opinion, Epson wouldn’t win the comparison. Even the junior model of the CanoScan series features a dust removal technology (the Reduce Dust and Scratches option) which works on photographs like a regular vacuum cleaner as I could see in my earlier tests. And even the junior CanoScan model supports hardware FARE Level 2 technology. Epson doesn’t offer such technologies in its entry-level and mainstream solutions, unfortunately.