Apple Color 1.5 - Manual (Page 227)

About Shadows, Midtones, and Highlights Adjustments
Like many other color correction environments, Color provides a set of three color balance
controls for the specific adjustment of color that falls within each of three overlapping
zones of image tonality. These tonal zones are the shadows, midtones, and highlights of
the image. If you were to reduce the tonality of an image into these three zones, it might
look something like the following illustration.
Original color image Simulated tonal zones, shadows, midtones,
and highlights
Areas most affected by the Shadow color
balance control
Areas most affected by the Highlight color
balance control
Areas most affected by the Midtone color
balance control
Three zone controls allow you to make targeted adjustments to the color that falls within
the highlights of an image, without affecting color in the shadows. Similarly, they allow
you to make separate adjustments to differently lit portions of the image to either make
corrections or achieve stylized looks.
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