Nikon LS-3500 - LS-3510 - Manual (Page 38)

5-6 Using The Macintosh Scanner Plugin
Software Reference for Scanners
Fig. 30 Resolution and Size Controls
These text edit boxes allow you to enter sizes directly in inches, centimeters
or pixels for either dimension. The numbers can be entered before or after a crop
has been drawn around the subject. One method is to type in the exact numbers
for the final size and resolution, and then lock the
File Size and draw the crop box
which will now be constrained. The resolution can also be interpreted based on
CCD Pixels using a 'pitch' number. This is an integer which is used to divide the
total resolution of 5000 pixels. For example, if one enters a value of five, then the
resulting resolution will be 5000 divided by 5, or 1000 pixels over the full 40mm
dimension of the scanning aperture, or 25 pixels/mm, 635 pixels per inch.
Scan Pitch
Scan Pitch is the number of scan area pixels that go into one pixel of the final
output image. If a scan was made at pitch 2, with the crop (shown in Figure 18) of
250, 1000, 4750, 4000; the actual scan would measure 2250 pixels by 1500 pixels
tall; or 1/2 the resolution of the scanner's full scan capability at 1588 pixels per
inch. The image would still cover the area described above, but every other pixel
would be skipped in the scan. Scan pitch is inversely proportional to the native
scanner resolution.
The scanner hardware does not process fractional, or non-integer pitches.
Pitches other than integer pitches are interpolated with an extra scaling step in the
final scan. This can lead to some performance attrition, depending upon the pitch
involved. If the plugin determines that speed may be affected, a small warning
appears in the dialog just below the output scan specification area.
The range of the Scan Pitch does not go below pitch 1, or above pitch 50.
The scan is specified though a combination of selecting a crop in the preview
area, and typing scan parameters into the editable text items displayed above.
There are different approaches that can be taken when defining a scan.
In the first example, to produce an 8 inch by 10 inch image suitable for 150
line screen output, set the height and width unit pop-up menus to inches, and the
resolution units to pixels/inch. Then just type 8 into the width edit field, 10 into
the height edit field, and 300 (for a good half-tone screen of 150) into the
resolution edit field.