Bilevel

A means of scanning done at a color depth of 1-Bit color, or in which the scanner only registers black or white. Bilevel scanning is often used for scanning line art, and when levels of gray are being scanned, the tolerance—or the gray level at which all shades below are registered as white and all shades above are registered as black—can be set. Such a scanner is known as a two-tone scanner, and bilevel scanning is also known as binary scanning.

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