Microtek ArtixScan 120tf Reference Manual page 95

86 Microtek ScanWizard Pro TX for Mac & PC
Appearance of curve if
Method chosen is " Line"
Appearance of curve if Method chosen is " Gamma."
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
Instead of dragging the
Gamma handle, you can also
enter directly the appropriate
Gamma value in the edit box.