Apple AppleVision monitors (OS 7.1) - Manual (Page 57)

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This chapter explains how to use the DigitalColor Meter application to
identify colors displayed on your AppleVision monitor. You can use
DigitalColor Meter to identify RGB, CIE, or Pantone colors.
About DigitalColor Meter
There are many different ways to reproduce color. Printers, for example, form
colors by mixing cyan, magenta, and yellow ink. Mixed together in equal
quantities these colors create black. By using less of some colors, other colors
are created. This is called a subtractive color process.
Monitors, on the other hand, create color using an additive process. They start
with black (no light at all), and add small amounts of red, green, and blue
light to form new colors.
Because of the different ways to construct and display colors, it is difficult to
describe a color so that it can be exactly reproduced by other devices. The
method used to create a color on one device will likely result in a different
color on another device. To make it easier to describe colors in a universal
way, the Commission on Illumination (CIE) has defined several color spaces
that precisely define colors based on where they fall within a certain range, or
gamut, of colors.
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DigitalColor Meter