Canon CanoScan D1250U2F User Manual page 59

Glossary
Contents
Glossary
Index
Auto Crop
After you select an area of the screen by clicking the Crop button and
dragging a rectangle around the object or text you want to crop, click the
Auto Crop button to size the rectangle exactly to the size of the object or
block of text enclosed in the rectangle.
Auto Tone Adjustment
Automatic analysis and adjustment of the image using Contrast/Brightness
and Gamma settings.
Bits and Bit Depth
A bit (Binary digit) is the smallest possible unit of information on a
computer; it represents yes or no; on or off; 1 or 0. Bit Depth is used to
describe the complexity of a graphic image.
One-bit, or bi-level, images are black and white. This is the Black and White
setting in ScanGear CS-U. Eight-bit grayscale uses 256 shades of gray to
accurately represent most black and white photographs or gray
interpretations of color images. This is the Grayscale setting in ScanGear
CS-U. Twenty-four-bit color, also called True Color, uses three eight-bit
channels, one channel each for Red, Green and Blue, to create up to 16.7
million colors. This is the Color setting in ScanGear CS-U.
Brightness
The overall amount of lightness or darkness in an image. An image with
maximum brightness tends toward white; an image with minimum
brightness tends toward black. While contrast refers to the range and
number of tones in an image, brightness refers to the intensity of tones.
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