Adobe Illustrator CS3 User Manual download pdf (Page 134)

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Chapter 5: Color management

A color management system reconciles color differences among devices so that you can be reasonably certain of the

colors your system ultimately produces. Viewing color accurately allows you to make sound color decisions

throughout your workflow, from digital capture through final output. Color management also allows you to create

output based on ISO, SWOP, and Japan Color print production standards.

Understanding color management

Why colors sometimes don’t match

No device in a publishing system is capable of reproducing the full range of colors viewable to the human eye. Each

device operates within a specific color space that can produce a certain range, or

gamut, of colors.

A color model determines the relationship between values, and the color space defines the absolute meaning of those

values as colors. Some color models (such as CIE L*a*b) have a fixed color space because they relate directly to the

way humans perceive color. These models are described as being device-independent. Other color models (RGB,

HSL, HSB, CMYK, and so forth) can have many different color spaces. Because these models vary with each

associated color space or device, they are described as being device-dependent.

Because of these varying color spaces, colors can shift in appearance as you transfer documents between different

devices. Color variations can result from differences in image sources; the way software applications define color;

print media (newsprint paper reproduces a smaller gamut than magazine-quality paper); and other natural varia

tions, such as manufacturing differences in monitors or monitor age.

Color gamuts of various devices and documents

A. Lab color space B. Documents (working space) C. Devices

What is a color management system?

Color-matching problems result from various devices and software using different color spaces. One solution is to

have a system that interprets and translates color accurately between devices. A color management system (CMS)

compares the color space in which a color was created to the color space in which the same color will be output, and

makes the necessary adjustments to represent the color as consistently as possible among different devices.

CMYK

RGB

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Adobe Illustrator CS3 User Manual Page 134