Apple Color 1.0 User Manual download pdf (Page 33)

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Chapter 1 Color Correction Basics 33

Complementary Colors

Two colors that appear 180 degrees opposite one another on the wheel are referred to

as complementary colors.

Adding two complementary colors of equal saturation to one another neutralizes the

saturation, resulting in a grayscale tone. This can be seen in the two overlapping color

wheels in the illustration below. Where red and cyan precisely overlap, both colors

become neutralized.

Understanding the relationship of colors to their complementaries is essential to

learning how to eliminate or introduce color casts in an image using the Color Primary

or Secondary color correction controls. For example, to eliminate a bluish cast in the

highlights of unbalanced daylight, you add a bit of orange to bring all of the colors to a

more neutral state. This is covered in more detail in Chapter 9, “Primary In,” on

page 163.

The HSL Color Space Model

The HSL color space model is another method for representing color, typically used for

user interface controls that let you choose or adjust colors. HSL stands for hue,

saturation, and lightness (roughly equivalent to luminance) and provides a way of

visualizing the relationships among luminance, hue, and saturation.

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Apple Color 1.0 User Manual Page 33

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