User interface operation46

Black and White

Black and White represents the image in black and white only, without inter-
mediate shades of gray in-between. That means each pixel of the image is
either 100% black or 100% white. Black and White is the best choice of
image type for scanning text or a pen or ink drawing. Since only 1 bit of black
or white information is required for each pixel , the disk space required for
saving a line art image is only about 1/24 of that required to save a 24-bit
True Color image.
Black and White Image
A combination of the words “picture” and “element,” a pixel is a single dot
on a computer display or in a digital image.

8-Bit Gray

A single-channel image consists of at least 256 shades of gray. An 8-bit scan-
ner produces a grayscale image with 1,024 shades of gray between pure
black and pure white. Choose this option for scanning black-and-white photo-
graphs.
With 8 bits of color information per pixel, the file size of an image is eight
times larger than that of a black-and-white image and 1/3 the size of a 24-bit
color image.
8-Bit Gray Image
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