40 Microtek ScanWizard for Macintosh
E. Interpolation Mode
The interpolation mode controls the way ScanWizard Pro interpolates (either
expands or shrinks) image data. Interpolation always occurs when the scan
resolution you select is different from the scanner's optical resolution. The
trade-off is speed vs. quality. If your application requires higher quality, use Bi-
linear (Quality) mode, especially if you are scanning higher-resolution line art
images.
A. Nearest Neighbor (Speed): When this option is selected, ScanWizard Pro will
do the following:
• Expanding (when scan resolution is higher than optical resolution): Linear
interpolation is used (i.e., makeup pixels are created by using the average of
the neighboring pixels).
• Shrinking (when scan resolution is less than optical resolution): Pixel drop is
used to match the resolution.
B. Bi-linear (Quality): When this option is selected, ScanWizard Pro always
scans in a high-enough resolution and then applies a bi-linear interpolation
algorithm to expand or shrink image data. This is a complicated mathematical
formula, and thus, takes longer to process.
