An advanced Hyper CCD III image sensor captures even more optical input for intricately detailed scans; smaller pixels allows for greater scanning precision. 3200 x 6400dpi scan resolution and 48-bit scanning depth makes possible 281 trillion colours and 16,000 shades of grey. Quality at an affordable price. Warm-up time is so fast – a mere 15 seconds, from the moment the CanoScan 4200F is switched on, to the time it is ready to start scanning. Preview scans appear on-screen in just 2.6 seconds. A full-colour A4 page scanned at 400dpi is completed in approximately 12 seconds. USB 2.0 Hi-Speed connection ensures fast file transfers between scanner and PC.