If you have a picture or slide that you wish to include in your presentation, then the graphic can be scanned into the computer. Scanner Hardware A scanner works by shining a light onto the picture, the reflected light is collected by the scanning head that converts this into a series of coloured pixels. Nowadays, scanners have a range of resolutions from 72 - 600 dpi and a colour depth from 2 colours to millions of colours. Scanner Software The scanner software will allow you to alter both the resolution and colour depth of the scan. If a picture is for use in a computer presentation, then scan it at 72 dpi and a maximum of 256 colours. This will give reasonable quality, while not taking up too much disc space. For printing, a higher resolution should be used. Be wary of scanning in pictures from books, magazines or newspapers. Many of these will be copyright and must not be used without the copyright holder’s permission. Using www.dabs.com, search for three scanners in different price ranges and complete the following table. Extra features may include a transparency adapter or a scan/fax/print/copy capability.
Answer the following questions in your jotter.
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