Visioneer 480 manual Options on the Twain Interface are

SCANNING WITH THE TWAIN INTERFACE 89

THE OPTIONS ON THE TWAIN INTERFACE ARE:

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 use the paper guides on the scanner so the page is not skewed otherwise the page will not crop properly.

Duplex—Scan both sides of the page. If this option is not selected, the scanner will only scan the side of the page facing down when you insert it into the scanner.