COMPUTER FUNDAMENTALS

Detailed explanation-1: -A scanner is a device that captures images from photographic prints, posters, magazine pages and similar sources for computer editing and display. Scanners work by converting the image on the document into digital information that can be stored on a computer through optical character recognition (OCR).

Detailed explanation-2: -When you scan an image, you reproduce it in an electronic, digital form. With the digital version, you can then do many things, including: store and retrieve the image to and from a digital storage disk, edit it in software programs like PhotoShop, and compress it for Web broadcast.

Detailed explanation-3: -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. Commonly used in offices are variations of the desktop flatbed scanner where the document is placed on a glass window for scanning.

Detailed explanation-4: -Scanning produces image taking line by line information. It works well for flat objects like papers and documents kept at very close distance. So, in your example of barcode, scanning and capturing image will use similar process but produce two different results in terms of quality.