Acer Film Scanner - Manual (Page 42)

English
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You can also click the curve to add new points and further change the
shape of the curve:
Input/Output Status Area
You can read the precise input/output value here.
When you have finished with adjustments, you can click OK to apply, or
click Reset to restore the default settings. To abort and exit the dialog box,
click Cancel.
The original image and its
Tonal Map. The curve is
straight and diagnal. Drag the curve to the left,
and the midtone area of
the image becomes
brighter. Drag the curve to the
right, and the midtone
area of the image
becomes darker.
Click to add a new point.