Apple Shake 4 - Manual (Page 663)

Chapter 23 Color Correction 663
m Click the Color control, then select a color from the Viewer or the ColorWheel (in the
Color Picker).
m Use the Virtual Color Picker. Press the relative key, R (red), G (green), B (blue), H (hue), S
(saturation), V (value), L (luminance), M (magenta), or T (temperature), and drag left or
right on the parameter line. (You can do this anywhere on the line, not just over the
Color control.)
m To group the R, G, and B sliders, press V (value) and drag left or right.
As an example, press R and drag right over the Add line. This adds to the red channel.
When the color control is bright red, press H and drag left and right. The hue of the
color shifts. This technique only modifies the color that is Added, Multiplied, and so on.
So, dragging a color control while pressing S (saturation) does not decrease the
saturation of the image, but only the saturation of the color that you are adding (or
multiplying) to the image.