Microtek 1000xl 参照マニュアル

Use the Curve Pointer
tool to define points in the
curve that will be
modified. When you click
on any point in the curve,
a black handle appears
to mark your position. To
remove the handle, drag
it off the graph.

Use the Curve Zoom Frame tool to
zoom in and out on a particular point in
the curve. Once the area is zoomed
in, you can then use the Curve Pointer
tool to define new points for better
precision. This is particularly useful
for working with 12-bit images, as
more detail can be seen in such
images. The zoom level can be seen
in the 

Zoom field. To zoom out, use

Option-click.

Use the Curve Pane tool to scroll
through the curve if the curve has
been zoomed in. This curve tool
can be used only if the curve has
been zoomed in with the Curve
Zoom Frame button (left).
Otherwise, the Curve Panel tool
will be dimmed.

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 darken the light tones

Appearance of curve if Method chosen is
"Gamma"

Appearance of curve if Method chosen is "Line"