Simplex vs . Scanner that scan one side of a page are referred to as simplex scanners, and those that scan both sides are called duplex scanners. Most scanning software will allow you to scan both sides of a document using a simplex scanner, but simply turning over the stack of pages and rescanning the back sides. However, if a significant portion of your documents contain information on both sides, a more expensive duplex scanner will be a good investment in productivity. If you have a need to scan larger pages, make sure you get a scanner that can handle them.
Most scanners offer a range of output resolutions.
As a reference point, a fax machine scans at 200 dpi. In most applications, a resolution of 200-300 dpi is used. Back to top Image processing Image processing is used to improve the quality of the scanned image or to modify it in some way for more efficient storage, data extraction or other processing. Deskew - electronic straightening of images that are scanned at a small angle. Despeckle - removal of small specks in the image.