Canon CanoScan D660U ScanGear CS-U 5.8 User's Guide - Page 90

Acquired Images, Auto Crop, Auto Tone Adjustment, Automatic Preview, Bits and Bit Depth

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Glossary Top Page Glossary Contents Index Acquired Images Images sent from your scanner software to the host graphics application. 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. Automatic Preview When the automatic preview feature is switched on, the original on the scanner is pre-scanned immediately as ScanGear CS-U is launched from the parent software application. To switch this feature on and off, open the Preferences sheet for your scanner and click the button for "Automatically execute a preview". (p.78) 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. 90

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90
Glossary
Top
Page
Glossary
Contents
Index
Acquired Images
Images sent from your scanner software to the host graphics application.
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.
Automatic Preview
When the automatic preview feature is switched on, the original on the
scanner is pre-scanned immediately as ScanGear CS-U is launched from
the parent software application.
To switch this feature on and off, open
the Preferences sheet for your scanner and click the button for
“
Automatically execute a preview
”
. (
p.78
)
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.