Apple ColorLaserWriter 12/600PS - Manual (Page 313)

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The Macintosh does a lot of work to make sure that the colors you see on
your monitor closely match the colors you get on your printers, scanners, and
other devices. The software that does this work is called ColorSync. Because
ColorSync does its work behind the scenes, you don’t have to know anything
about it. But if you’re curious, this appendix explains how ColorSync works
and how you can benefit from using it.
The problem that ColorSync solves
Providing consistent color with desktop computers is a technical challenge.
Reproducing colors consistently from device to device is difficult because
colored light on your monitor is very different from printed ink. Different
color devices use different methods for representing color information and
produce different ranges of colors.
Monitors (and most scanners) produce colors by mixing red, green, and blue
light–called RGB color. Most printers produce colors by mixing cyan (a
shade of blue), magenta (a bright pink), yellow, and black ink–called CMYK
color. Since monitors and printers have different color capabilities, they
cannot reproduce each other’s colors exactly.
In addition, no two monitors or printers produce exactly the same colors. (You
can see an example of the differences among television sets at a consumer
electronics store.)
Appendix D
Working With ColorSync