Microtek 1000xl 参照マニュアル

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Reference: The Advanced Image Correction tools         91
Appearance of curve if
Method chosen is "Line"
Instead of dragging the Gamma handle, you can also  directly enter the
appropriate Gamma value in the edit box. Dragging points on the curve to a
Gamma value above 1.00, will lighten the dark tones. Dragging points on the curve
to a Gamma value below 1.00 will add shadows to light tones
Appearance of curve if
Method chosen is "Gamma"