User Manual

By default, a control point influences the portion of each curve that falls between its
neighboring two control points.
Control point adjustments affect the entire portion of a
curve between adjacent control points.
In the top screenshot, you can see that the control point at the position of the pointer is
affecting the larger part of the curve that falls between the lower left-hand control point (which
is there by default), and a user-created control point placed up within the highlights of the curve.
In the bottom screenshot, an additional control point to the left of the one being adjusted limits
the area of the curve that is adjusted. By careful placement of additional control points, you can
make extremely targeted adjustments to images using the Custom curves.
This example highlights the importance of using control points to “lock off” portions of a curve
at a neutral or nearly neutral position to prevent changes to specific portions of an image, even
while using other control points to make changes.
NOTE: The HSL curves also have an optional adjustment mode using Bezier curves
that will be covered in those sections.
Sampling Images to Place Control Points on Curves
Another way you can add control points to curves is to move the pointer to the Viewer, and click
to sample a color value and place a control point at the position on the currently open curve
that corresponds to that value. This works with Custom, Hue, and HSL curves.
Clicking on a feature of the image
Chapter – 118 Curves 2674