Canon CanoScan D1230UF User Manual page 103

Glossary
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Mid-point
The mid-tone portion of the image scanned as Color or Grayscale. When
you click on the image with the Mid-point eyedropper, all tones between
the black-point and white-point are adjusted in relation to the mid-point
setting.
Mid-tone
Mid-tones are the middle range of tones in an image, between
highlights and shadows. Midtones can be adjusted for color and
grayscale images with the Gamma tool.
Moiré reduction
Moiré reduction can be switched on with the Descreen button on the
Scanner sheet. Moiré patterns are caused by poor dithering as a result of
scanning images from published materials like newspapers, magazines,
books, etc. When the Descreen feature is on, moiré reduction smoothes
the overall appearance of the image and enhances image quality.
OCR (Optical Character Recognition)
OCR (Optical Character Recognition) software converts text images into
actual text characters readable by a word-processing program or similar
application. The Text Enhanced scan setting sharpens black and white
contrast to assist in the accurate recognition of characters in OCR
software.
Optical resolution
A scanner's resolution capability. See also dpi, Resolution.
Output Dimensions
The final dimensions of the scanned image, based on paper size,
cropping, and scaling.
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