Canon CanoScan D646U User Manual page 97

Glossary
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Glossary
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TWAIN
TWAIN refers to an industry standard for transferring information from
devices (such as a scanner or digital camera) to your computer. One
interpretation of the acronym is "Technology Without An Interesting
Name."
Underexposed
A dark photographic image that was exposed to too little light when it
was photographed.
Unsharp Mask
Sharpens an image, like a photograph that is slightly out of focus, by
emphasizing the contrast to make outlines more clear.
USB
An abbreviation of Universal Serial Bus, an interface for external devices
connected to a computer and easilly used simply by plugging and
unplugging the USB cable while the computer is switched on.
White-point
The lightest portion of the image scanned as Color or Grayscale. When
you click on the image with the White-point eyedropper, all tones lighter
than the selected sample tone are adjusted to white.
Width
The Width text box contains the width of the current selection or, if
there is no selection, the maximum horizontal output size, based on the
currently selected paper size.
Width-Height ratio
Proportion of the image. To keep the width-height ratio intact, click the
Keep Proportions button before changing the width or height values.
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