Scanner—Scanning the document is only one part of the process.

1. An image scanner—often abbreviated to just scanner— is a device that optically scans images, printed text, handwriting, or an object, and converts it to a digital image
2. Modern scanners typically use a charge-coupled device (CCD) or a Contact Image Sensor (CIS) as the image sensor, whereas older drum scanners use a photomultiplier tube as the image sensor
3. scanner is digital camera scanners, which are based on the concept of reprogramming cameras
4. Drum scanners capture image information with photomultiplier tubes (PMT), rather than the charge-coupled device (CCD) arrays found in flatbed scanners and inexpensive film scanners
5. A flatbed scanner is usually composed of a glass pane (or platen), under which there is a bright light (often xenon or cold cathode fluorescent) which illuminates the pane, and a moving optical array in CCD scanning.
6. Hand scanners come in two forms: document and 3D scanners. Hand held document scanners are manual devices that are dragged across the surface of the image to be scanned
7. One printer manufacturer has introduced all-in-one printer which is provided with a desktop digital camera scanner that has 10 megapixel image sensors. For scanning a business card or a full 8.5x11 inch image
8. Cameras in smartphones have reached a resolution and quality that reasonable quality scans can be achieved by taking a photo with the phone and using a scanning app for post-processing
9. Scanners typically read red-green-blue color (RGB) data from the array. This data is then processed with some proprietary algorithm to correct for different exposure conditions
10. Scanning the document is only one part of the process. For the scanned image to be useful, it must be transferred from the scanner to an application running on the computer.