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	Digital Imaging An image has to be digitized for a computer to understand it and therefore any image on a computer is digital. Manipulating these images (view, edit etc) is Digital Imaging. Image Resolution The total number of pixels in an image. The more pixels the better the image. This is expressed in dots per inch (dpi) and therefore a printer with 600 dpi resolution will produce an image with 600 dots in a line within each inch. The more dots the better the print quality. A computer monitor uses the same way to describe its quality of display. A 640 x 480 will display an image with 640 pixels on 480 rows. Higher quality display resolution could be 800 x 600 or 1024 x 768 or 1280 x 1024 Colour depth This refers to the maximum number of colours that an image contains and is dictated by the resolution of the image. Usually expressed in terms of 8 bit or 16 bit or 32 bit. 8 bit images contain up to 256 different colours 16 bit images contain up to 65,536 different colours 32 bit images contain up to 16 million different colours Hence the colour depth is sometimes is referred to as the bit depth as it can be seen they are directly related.
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