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Enhancing Images
Editing Curves Directly
Fine adjustments can be made to brightness and contrast in specifi c portions of the tone range
by adding additional points to the curves for each channel. These points can be freely ad-
just ed by drag ging them into new positions, changing the shape of the curve. Steepening the
slope in a given portion of the curve will enhance contrast in that portion of the tone range.
Changing the curve so that input levels in a given portion of the tone range are mapped to
higher output levels will brighten tones in the affected tone range; similarly, chang ing the
curve to map input levels to lower output levels will darken tones in the affected range.
Adding New Points to the Curve
Move the cursor over the curve edit display and click once to enter curve edit mode. Move
the cursor to the position where you would like to add a new point, then click. A new point
will be added at this position and the curve will automatically be adjusted to pass through this
point. A point corresponding to a selected location in the active image can be added by click-
ing the
button and then clicking in the desired area in the image window. The position of
the point can be adjusted by dragging it to a new location within the curve edit display. The
image in the active window will automatically be adjusted to refl ect changes to the curve.
Removing Points from the Curve
Points can be removed from the curve by dragging them out of the curve window.
Resetting the Active Curve to Linear
The default linear curve for the current channel can be restored by clicking the
button in
the Curves palette.
Resetting All Curves to Linear
To reset all curves to linear, click the
button. All curves will be reset and the RGB master
channel will be displayed in the Curve palette.