2011

■ Select a single channel that you want to modify by deselecting the
Lock button.
Drag the red channel field to the right to increase, or to the left to
decrease, the level of the red channel.
The green and blue channels are not affected. However, the overall
luminance field updates to reflect the change.
NOTE You may also type values into the channel fields and press Enter. In the
case of modifying all channels uniformly, when values are typed into any field,
the other fields update. The luminance field will update regardless of which method
is used to modify the values.
Using the Trackball to Modify Negative Film Gamma, Cineon Reference and
Linear Reference
The trackball allows you to modify levels with a more freestyle, intuitive
approach. The trackball emulates a typical 360-degree color wheel that can
be dynamically changed by dragging the center of the color wheel.
Consequently, the effect on the red, blue, and green channels is predictable.
For example, dragging the trackball towards the red portion of the color wheel
increases the value of the red channel, but decreases the values of both the
blue and green channels, and adds blue and green to the shadows and
midtones of the image.
Modifications made using the trackball are cumulative; each movement of
the trackball is added to the previous one. The trackball changes color to reflect
the degree of change.
To modify levels with the trackball:
➤ Drag the trackball to modify levels in the image.
Modifying Negative Film Gamma, Cineon Reference, or Linear Reference Levels | 629