Canon CanoScan FB 630U User Manual - Page 70

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 platen is pre-scanned immediately as ScanGear CS is launched from the parent software application. To switch this feature on and off, open the Preferences sheet and click the button for "Automatically execute a preview". 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 bilevel images are black and white. This is the Black and White setting in ScanGear CS. 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. 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. 70

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Top
Page
Glossary
Contents
Index
70
Glossary
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 platen is pre-scanned immediately as ScanGear CS
is launched from the parent software application. To switch this
feature on and off, open the Preferences sheet and click the
button for “Automatically execute a preview”.
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 bilevel images are black and white. This is the Black
and White setting in ScanGear CS. 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. 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.