Canon CanoScan D646U User Manual page 48

chapter 4
What is on the
Screen?
Top Page
Glossary
Contents
Index
Eyedroppers (Black-point, Mid-point, White-point)
Click one of the three eyedroppers then click the portion of the image in
the Preview Area that you want to sample, or enter values in the text
boxes, or drag one of the three triangles at the bottom of the graph to
adjust the value. The shape of the tone curve and histogram changes to
reflect the current Histogram setting for the current Channel, and the
image in the Preview Area changes to reflect the adjustment.
A White-point value must be larger than a Black-point,
and a Mid-point value must be between the Black-
point and White-point.
Note
Reset
Resets the default values:
• Black-point:
• Mid-point: 128
• White-point: 255
0
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