Microtek ScanMaker 5 User's Guide download pdf (Page 195)

E-8 Microtek ScanWizard 5

Choosing the best resolution setting

Scanning at a higher resolution requires more time, memory, and disk space.

When choosing a resolution setting, consider the type of image you're scanning

and the printing method. Printed images have their own resolution, as measured

in lines per inch (lpi), which is distinct from the resolution of electronic images

(as measured in ppi).

An easy way to determine the best resolution for your intended output is to find

out the lines per inch (lpi) capability of your output device and multiply it by a

Quality Factor (1.5 to 2.0).

For instance, to tailor your scanned image to a typical magazine printing press

that prints at 133 lines per inch, multiply 133 x 1.5 or 2.0, which gives 199.5 or

266. In this case, the optimal resolution setting for your image would then be

200 ppi to 266 ppi (depending on how high the output quality will be). Lpi

varies, depending on the quality of the printing job. A newspaper uses

approximately 85 lpi, magazines from 133 to 150 lpi, and fine art books may go

as high as 200 to 300 lpi.

A rule of thumb for choosing the right Quality Factor is, for images with printing

screens less than or equal to 133 lines per inch, set Quality Factor to 2; above

133 lines per inch, set it to 1.5; contone printer (continuous tone printer, such

as dye-sublimation printer), set it to 1.0

If you're outputting images to a monitor (such as doing multimedia work), you

need not scan images higher than 72 ppi, as monitors are capable of only

showing images up to 72 ppi. A higher-resolution image will not be any clearer

on the monitor and will simply create larger files.

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Microtek ScanMaker 5 User's Guide Page 195