Microtek ScanMaker 5 User's Guide download pdf (Page 123)

Reference: The Settings Window 6-45

Unit selection

The unit of measurement for resolution is in ppi (pixel per inch) or lpi (lines per

inch). Lpi settings are dimmed if the ruler unit is in pixels, and vice versa for

ppi.

To select your option:

• Choose lpi (1x) if you know precisely the resolution you need for your

image. Or, in case of Stochastic halftone and contone (continuous tone)

printing.

• Choose lpi (1.5x) to produce resolution that is one and one-half times the

screen frequency. Normally used on the screen higher than 133 lpi halftone

printing.

• Choose lpi (2x) to produce resolution that is two times the screen frequency.

Normally used on the screen equal to or less than 133 lpi halftone printing.

• Choose lpi Custom to produce customized resolution.

Lpi is widely used in professional offset printing. Values of ppi and lpi are

exchangeable. During scanning, ScanWizard 5 first converts the unit into ppi

before sending image data to the scanner.

Quality Factor represents multiplication factor for converting lpi to ppi. For

example, an 85 lpi printing is 127 ppi multiplying quality factor 1.5; or 170 ppi

multiplying quality factor 2. The Custom setting allows you to define values

from 1 to 4, decimal value is accepted, such as 1.33.

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Microtek ScanMaker 5 User's Guide Page 123