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.
Pre-processing time is not included.
Connecting the bundled USB cable to the port corresponding to USB3.0 and above on PC. Colour document scan speed: (Colour A4, 300dpi) is measured with ISO/IEC 29183 Target-A. Colour photo scan speed: (4x6", 300dpi) is measured with ISO//JIS SCID No.2. 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.