Canon CanoScan FB 630U User Manual page 75

Glossary
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Glossary
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Index
End points
The points at each end of a preset or custom tone curve. The curve
end points cannot be deleted. If they are dragged to or past an
edge, they remain on the edge. Add points to the curve by clicking
anywhere in the curve box. (Tone sheet - Special Tone Curves)
Exective
A U.S. standard paper size measuring width x height:7.25 x 10.5 in.
(184.2 x 266.7 mm)
Eyedropper
A Histogram tool used to sample the Black-point, Mid-point, and
White-point areas in the previewed image. (Tone sheet -
Histogram)
Full Platen
The maximum scannable area on the scanner's document glass, 8.5
in. x 11.7 (width of U.S. Letter and length of A4 paper sizes).
Gamma Curve Tool
The Gamma Curve Tool lets you change the midtones of colors to
increase the contrast between colors, and enhance the overall
image. When you increase the Gamma value, light colors are made
lighter, and dark colors are made darker. The graphed curve
represents the relationship between input and output values for
the midtones of the preview image.
Gamma correction
The process of adjusting the midtones to improve an image.
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