Canon CanoScan N650U User Manual page 96

Glossary
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Glossary
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Test Scanner button
The Test Scanner button on the Scanner sheet starts diagnostic tests and
reports if there are any problems with the scanner.
Text Enhanced(OCR)
A feature used by ScanGear CS-U to increase the accuracy of text scans.
When Text Enhanced is selected for the Color Mode, images are scanned
as Grayscale (8 bits per pixel) and converted to Black and White (1 bit
per pixel) using Canon ImageTrust processing software.
Threshold
In a black-and-white image, the point at which a gray pixel is determined
to become either black or white. The Threshold slider is on the Halftone
sheet. Adjust the Threshold value when you are scanning a grayscale or
halftone original with the Black and White setting.
Tone Curve
The curve displayed with the Tone tab tools to indicate the Black-, Mid-,
and White-point tones in a color or grayscale preview image. You cannot
edit the curve except with the Special Tone Curves tool.
Tone sheet
The Tone sheet contains tools that let you adjust and correct the image
tone. The Tone sheet tools include Auto Tone, Contrast/Brightness,
Gamma, Histogram, and Special Tone Curves.
Toolbar
A set of ScanGear CS-U tool buttons, located above the Preview Area,
for image selection, orientation, and other basic adjustments.
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