Apple Color 1.5 - Manual (Page 232)

The Highlight color control is extremely useful for correcting color balance problems
resulting from the dominant light source that's creating the highlights, without
inadvertently tinting the shadows. In the following example, a bit of blue is added to the
highlights to neutralize the orange from the tungsten lighting.
Color Balance Control Overlap Explained
The broadly overlapping nature of color correction adjustments made with the three
color balance controls is necessary to ensure a smooth transition from adjustments made
in one tonal zone to another, in order to prevent banding and other artifacts. In general,
adjustments made to the color in one tonal zone also affect other tonal zones in the
following ways:
• Adjustments made to the Shadow color controls overlap the midtones and the darker
portion of the highlights but exclude areas of the image at the highest percentages.
• Adjustments made to the midtones affect the broadest area of the image but don't
affect the lowest percentages of the shadows or the highest percentages of the
highlights.
• Adjustments made to the highlights affect the midtones as well, but not the lowest
percentages of the shadows.
Controlling Color Balance Control Overlap
While the tonal zones that are affected by the three color balance controls are predefined
by the mathematical operations they perform, it is possible to exert some control over
what areas of an image are being affected by the corrections of a particular color balance
control. This is done by applying opposing corrections with other color balance controls.
232 Chapter 9 The Primary In Room