Ambir ImageScan Pro 820i Duplex Document Scanner: Technical Information for the Ambir ImageScan Pro 820i Document Scanner Image Sensor: * Contact Image Sensor (CIS) Scan Resolution: * Optical: 600 dpi Bit Depth: * 24-bit Color * 8-bit Grayscale Scan Speed: * Maximum Mono Scan Speed (ppm): 25 * Maximum Color Scan Speed (ppm): 8 * Maximum Mono Scan Speed (ipm): 50 * Maximum Color Scan Speed (ipm): 8