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20 GPSolo 42 (2003)
Scanners

handle is hein.journals/gpsolo20 and id is 504 raw text is: SCANNERS By J Anthony Viftal ou've decided you need a scanner ill your office. As with any piece ol hardware, know- ing what you want it to do and how you plan to use it will help you make the best possi- ble decision about which model in buy lut irst, as with most tech- trology, scanners have a language all their own. arid you should he conversant with at least the basic terminology * Color depth. 1 his somewhat mislead- ing plrdse refers to the cumber of pos- sible colts. Manuifacttrers generally advertise the Internal or input color dep th, typicaly 48 bits, rather than the outpJ)ut color depth, whiceh is what you'll actually see and is limted hy tihe 24-bit niaxininw must applications (apps) can handle. Adobe Photoshop is among the apps that can handle up to 48 bits ol image data. As internal J. Anthony Vltal is a business trial lawyer in Los Angeles, California. He speaks and writes frequently on legal technology topics. He can be reached at tony.vlttal@abanet.org. color-depth numbers rise, generally so does the quality of the image, but the real test of an inexpensive scanner is how well it converts the scan to 24-bil output. This can be determined only by view-ing the tesults. * Scan element type. The technology used to capture an image can make a difference in the quality of the result. Most ordinary flatbed scanners use a CCD (charged coupled device) scan- ning element, but so1e coiiMpact scan- ners use the smaller CIS (contact image sensor). Scanners using a CCD typically produce better iestilts. 0 Optical resolution. Optical resolution refers to the maximum number of dots per inch (dpi) a scantiner cat capture %it1h lie imaging haidwaiC. WiLh corn- modity flatbed scanners, the optical resolution typically ranges between 600 x (00 dpi and 1200 x 2400 dpi. A lower optical resolution, lot example 300 x 300 dpi, generally works, even for scanning and printing photograph- ic images the same size as the otiginal. If you want to scan small originals- photographic slides, for example- and enlarge them, however, lool for the highest possible resohtion you can afford. Scanners with optical resolu- tion greater than 1200 x 2 400 dpi are generally professional grade and are Ce\pcti W. * Interpolated resolution. Interpolated resolutionr esults front software pro- cessing of the scanned image that fills in spaces between scanned dots with other, artilicially generated dots, Inter- polated resolution is importanit only if you plan to sca line art aid enlarge it dramatically--to produce trial graph- ics, for example-or senid it to a photo- typesetter, because interpolation in some cases will eliminate jagged fte lines. Commodity flatbed scanners usually offer interpolated resolutions of 960(0 x 9610 dpi, and some claim as much a.s 19200 x 19200 dpi. * Maximum supported media size (max- inium s can area), Low-cost flatbed scanners, now commodity item;, sc-air media up to 8. 5 x I1 inches (letter- sized) or 8.27 x 11,69 inches (A- sized). hew inexpens ive scanners can 42 UPSOLO December 2003 GPSOLO December 2003 42

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