Avision AV810CPlus Manual do Utilizador descarregar pdf (Página 36)

4-11

Gray (4096 levels gray scale/Internally)

A single-channel image consists of at least 256 levels of shades of

gray in an image. A 12 bits scanner produces a Gray image with

4096 shades of gray between pure black and pure white. Gray is

the best choice of image if you wish to scan a black and white

photograph. With 12 bits of color information per pixel, the disk

space required to save a gray image is eight times more than

lineArt and 1/3 of that required to save a 24-bit true color image.

Figure 4-7 A Gray Image

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Avision AV810CPlus Manual do Utilizador Página 36