Canon CanoScan N650U User Manual page 90

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.
Executive
A U.S. standard paper size measuring 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 tab - Histogram)
Full Platen
The maximum scanning area on the scanner's document glass,
216 x 297 mm (width of U.S. Letter and length of A4 paper sizes).
Gamma Curve
The Gamma Curve 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.
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