Microtek ScanMaker 6400XL Reference Manual page 80

Dragging the lower
left section of the
line above the
default diagonal line
will add shadow to
Dragging the Gamma handle toward left
(Gamma value above 1.00), will lighten the
dark tones. Likewise, dragging the handle
toward right (Gamma value below 1.00), will
add shadow to light tones & vise versa
72 Microtek ScanWizard Pro for Windows
Dragging the upper
right section of the
line below the default
diagonal line will add
lightness to shadow
tones
light tones
These sections
of color tones are
unchanged
Only this section (lower
chroma) of Saturation
Range; 0 to 50, will be
affected by Gradation
adjustment
Current Gradation method
used is
"Line"
Coordinates information of
cursor position within grid
This section (higher chroma
and outside the set
Saturation Range; 51 to
100) will NOT be affected
by Gradation adjustment
Enable this check box to
show simulated effect of
the adjustment on the
prescan image
Current Gradation method
used is
"Gamma"
Instead of dragging the
Gamma handle, you may
directly enter the appropriate
Gamma value in this setting
edit box