Optical resolution is a measure of maximum hardware sampling resolution, based on ISO 14473 standard.
Increasing the scanning resolution will limit the maximum possible scanning area.
Preprocessing time is not included.
Colour document scan speed is measured with ISO / IEC 24735 Annex C Test
Chart A. Scan speed indicates the time measured between pressing the
scan button of the scanner driver and the on-screen status display turns
off. Scan speed may vary depending on system configuration, interface,
software, scan mode settings and document size etc.
The fastest speed in Hi-Speed USB on Windows PC. Transfer time to computer is not included.