An image scanner is an input device designed to convert physical visual documents or pictures into digital formats. The process generally involves placing the source material on a flatbed, where it is illuminated and passed beneath a sophisticated sensor array. The device captures reflected light across the spectrum, translating the variations in tone and detail into electrical signals. These signals are then processed by internal circuitry and outputted as digital data files, allowing the captured images to be stored, manipulated, and transmitted electronically. Modern scanners employ various technologies, such as CCD or CIS sensors, to achieve high resolution and accurate color reproduction, making them fundamental tools in digital archiving and reproduction processes.