Canon CanoScan N670U CanoScan N670U/N676U/N1240U ScanGear CS-U 6.2 for Win/Mac - Page 47

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

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chapter 3 What is on the Screen? Contents Troubleshooting Glossary 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 Note and White-point. Reset Resets the default values: • Black-point: 0 • Mid-point: 128 • White-point: 255 47

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47
chapter 3
What is on the
Screen?
Troubleshooting
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.
Reset
Resets the default values:
•
Black-point
:
0
•
Mid-point
:
128
•
White-point
:
255
Note