light values, scanners use prisms, lenses, and other optical components. The quality of the glass affects the excellence of the final picture. The amount of light reflected by the image and picked up by the sensor is in turn changed to voltage proportional to the light intensity. The brighter part of the image cause more light to be reflected which results in a higher voltage (2). The sensor component itself is implemented using one of three different types of technology: the first is photo multiplier tube (PMT). A technique invented through the studying of the drum scanners that are no longer in use; the second is charge-coupled device (CCD). A type of sensor used in desktop scanners; the third is contact image sensor (CIS); this is the newest of the three, and it integrates scanning functions into fewer components, which allows them to be much smaller in size (3).
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