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72 VISIONEER STROBE XP 450 SCANNER USER’S GUIDE
THE TWAIN INTERFACE OPTIONS
Mode—Select a scanning mode:
Black&White to scan in black and white. Use this setting for letters,
memos, and other black and white material. This scan mode produces
the smallest file size.
Grayscale to scan items such as documents containing drawings or black
and white photographs. The scanning produces an image of up to 256
shades of gray. You can also scan a color document to turn its colors into
gray shades. The file size is about one third that of a color scan.
Color to scan magazine articles, photographs, and other color images in
full color. Color scans have the largest file size.
Resolution—The maximum resolution is 600 dpi; the minimum is 50 dpi.
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.
Brightness—Increasing or decreasing the Brightness makes the scanned
image lighter or darker.
Contrast—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 not available for Black & White
scanning.
AutoCrop to Original—Select this option to let the scanner automatically
determine the size of the item being scanned. Always make sure the paper
guides are against the edge of the paper in the input tray. This helps to
prevent the paper from being fed through at an angle (skewed). Skewed
pages may not crop properly.