Acquired Images; Auto Crop; Bits And Bit Depth - Canon CanoScan D1230UF User Manual

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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.84)

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.
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