Canon CanoScan D646U User Manual page 94

Glossary
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Glossary
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Preview image cache
When the preview image cache feature is switched on, the image in the
Preview Area from the previous session with ScanGear CS-U is saved and
displayed the next time 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 "Display
saved preview image".
Proportion
The ratio of width to height. When you click the Keep Proportions
button, the image size is maintained in the same proportion whenever
you change either the width or the height.
Resolution
The degree of detail, translated into the number of pixels or dpi, which a
device such as a scanner, video monitor, printer, or other image-
displaying device, can display or reproduce. See also dpi, Pixel, Scan
Resolution.
Rotate Left
The Rotate Left tool rotates the preview display 90 degrees
counterclockwise. If the Preview Area is in portrait orientation, it
becomes landscape and vice versa.
Rotate Right
The Rotate Right tool rotates the preview display 90 degrees clockwise. If
the Preview Area is in portrait orientation, it becomes landscape and vice
versa.
Sampling
In scanning, sampling is the process of measuring and recording the
tonal or color value in an image and converting it to digital information.
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