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92 VISIONEER STROBE XP 450 SCANNER USER’S GUIDE
Resolution—Drag the slider to the right or left to adjust the dots
per inch (dpi) of the resolution. The maximum resolution is 600
dpi; the minimum is 50 dpi. This option determines the amount of
detail you can see in the scanned image. The higher the dpi setting,
the sharper and clearer the scanned image. However, higher dpi
settings take longer to scan and produce larger files for the scanned
images. Usually the higher resolution settings are used for precision
work, such as photographs or fine artwork.
Brightness and Contrast—Sometimes an image is scanned with
the brightness and contrast set too light or too dark. For example, a
note written with a light pencil may need to be scanned darker to
improve legibility. Increasing or decreasing the brightness makes the
scanned image lighter or darker. Contrast refers to the difference
between the lighter and darker portions of the image. Increasing the
contrast emphasizes the difference between the lighter and darker
portions, decreasing the contrast de-emphasizes that difference.
Contrast is used in conjunction with brightness.
AutoCrop to Original—Select this option to let the scanner
automatically determine the size of the item being scanned. For
example, if you scan a 5" x 7" photo, the scanner will determine the
size of the photo, and the scan area is the size of that photo.
When using the AutoCrop to Original option, always use the paper
guides on the scanner so the page is not skewed.