Scanner is an input device that monitors an image, Document or an object and converts it to a digital image. The basic principle of a scanner is to analyze an image and process it in some way.

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Scanner’s Accuracy and quality is measured in terms with the resolution. Resolution is measured in terms of dots per inch (dpi). A scanner with high resolution detects more elements of a picture so that scanner’s more precise. There are different types of scanners. Each scanner has its own unique features. Based upon the user’s requirement a scanner has to be chosen.

Types of scanners:

  • Handheld Scanners: This type of Scanner typically does not provide good image quality. However, it can be useful for quickly capturing text.
  • Flatbed Scanners: These scanners are also called Desktop Scanners, are the most versatile and commonly used scanners.
  • Sheet fed Scanners: These scanners are similar to flatbed scanners except the document is moved and the scan head is not movable. A sheet-fed scanner looks a lot like a small portable printer.
  • Photo drum Scanners: These scanners are best for those who only need a scanner as a digitizing device for fax documents, or for keeping a digital record of printed documents.
  • Slide Scanners: Because photographic slides are small and require much higher scanning resolutions than larger documents and images, slide scanners were developed. These scanners are dedicated to scanning only transparencies: either photographic negatives, or slides. They have no capacity for scanning other originals. These slide scanners are in use by many photographers and publishers because they produce high-quality scans.

Different types of Scanner’s are used for different applications. The capability and cost of scanners differ from type to type. The scanners required for industrial purpose are different from scanners meant for use at home or in small offices. You can scan large sheets of paper or books with large scanners. Small scanners can be used to scan photos or small pages.

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