Apple Color 1.5 - Manual (Page 216)

Here are two examples of using the Midtone contrast slider. The midtones have been
lowered in the following image. Notice how the overall image has darkened, with more
of the picture appearing in the shadows; however, the highlights are still bright, and the
shadow detail has not been lost. The top and bottom of the gradient's slope in the
Waveform Monitor remain more or less in place, and the slope itself curves downward,
illustrating the nonlinear nature of the adjustment.
Next, the Midtone slider is raised. The image has clearly lightened, and much more of the
picture is in the highlights. Yet the deepest shadows remain rich and dark, and the detail
in the highlights isn't being lost since the highlights are staying at their original level.
Again, the top and bottom of the gradient's slope in the Waveform Monitor remain more
or less in place, but this time the slope curves upward.
216 Chapter 9 The Primary In Room