Resolution Unit; Scan Frame Settings - Microtek ScanMaker 6100 Pro User Manual

scanner's optics. Interpolated resolution is software-enhanced
resolution and can be useful for enlarging very small images or for
printing line art to obtain superior results.

Resolution Unit

The unit of measurement for resolution is in ppi (pixels per inch) or
lpi (lines per inch). Lpi settings are dimmed if the ruler unit is in
pixels.
To select your resolution unit:
Choose ppi if your scanned images are intended for on-screen
display; you do not have to go higher than the target
resolution of your monitor (usually 72 dpi for Macintosh and
96 dpi for Windows). A higher resolution will simply increase
the file size of your image without any perceptive
improvement in image quality.
Choose lpi if your scanned images are to be printed. If you
choose 1x, for instance, your scanned image will be printed at
133 lines per inch, resulting in a 133-dpi image. At 1.5x, the
image will be printed at 199.5 dpi; and at 2x, the image will
be printed at 266 dpi. The Custom option allows you to set an
lpi value of your own specification.
In choosing an appropriate lpi value, keep in mind that if the
resolution is too low, pixelization of the image results, in which the
Postscript language uses a single pixel's color values to create more
than one halftone dot. If the resolution is too high, the file size
becomes unwieldy and your file ends up containing more
information than the printer needs, slowing down the printing
process.

Scan Frame settings

The Scan Frame settings (width and height) provide controls
relating to the output image dimensions.