Canon CanoScan D2400UF CanoScan D1230U/D2400U ScanGear CS-U 6.1 for Win Guide - Page 50
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 50