Canon CanoScan N650U User Manual - Page 47

Black-point, Mid-point, White-point, Eyedroppers Black-point, Reset

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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 BlackNote point and White-point. Reset Resets the default values: • Black-point: 0 • Mid-point: 128 • White-point: 255 47

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47
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.
Note
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.
Reset
Resets the default values:
•
Black-point
:
0
•
Mid-point
:
128
•
White-point
:
255