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  1. 1. SCANNER<br />TrầnThịMai<br />2. NguyễnThịHồngNgọc<br />3. Dương ThịThanhThúy<br />4. NguyễnThịAnhThư<br />5. VũThịTrâm<br />
  2. 2. 1. WHAT IS A SCANNER?<br /> A device that optically scans images, printed text, handwriting, or an object converts it to a digital image.<br />
  3. 3.
  4. 4. 2. TYPES OF SCANNER<br /><ul><li>Flatbed scanner
  5. 5. Slide scanner
  6. 6. Handheld scanner</li></li></ul><li>Flatbed scanner<br />
  7. 7. <ul><li> Usually made of a glass pane, which is illuminated with a bright light found underneath, and a moving optical CCD array. </li></ul>CCD: Charge- Couple Devices<br />
  8. 8. <ul><li>Images to be scanned are placed face down on the glass and the sensor and light source move across the glass pane reading the entire area.</li></li></ul><li>Slide scanner<br />
  9. 9. <ul><li>Illuminates the slide and projects the image onto a digital scanning element which converts the image to a digital photographic format like .jpeg or .gif. </li></li></ul><li>Handheldscanner<br />
  10. 10. A manual device that is dragged across the surface of the image to be scanned.<br />
  11. 11. Scanning difficult as this requires a steady hand, to avoid uneven scanning rate that would produce distorted images. <br />
  12. 12. Have a "start" button held by the user during the scan, some switches to set the optical resolution, and a roller which generates a clock pulse for synchronization with the computer .<br />
  13. 13. Operate by using 3 rotating lamps<br />Each has a different coloured filter: red, green and blue<br />Combined into one by appropriate software<br />
  14. 14. 3.What does a scanner do?<br /><ul><li>Scan an image to put into a document or a power point presentation
  15. 15. Scan an image to email to someone </li></li></ul><li>3.What does a scanner do?<br /><ul><li>Scan a document as an image (this means you cannot edit it)
  16. 16. Scan a document directly to a pdf file</li></li></ul><li>Thanks for your attention<br />
  17. 17. Thanks for your attention<br />