Oki C 9400 User Manual download pdf (Page 341)

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use RGB (additive primaries) while printers use CMYK (subtractive primaries, plus black).

In addition, there is a limit on how many colors a monitor or printer can generate. This is known

as a device's color gamut:

Some colors can be reproduced on both devices, while others can be displayed on a monitor

but cannot be printed, or vice versa. In practice this may lead to a printed page not matching the

original on-screen image. What has happened?

Images can be captured:

 through scans

 through digital photography

 through direct input via application programs

But however the original image is obtained, it will be displayed and manipulated on-screen in

RGB color, then converted to CMYK for printing. Each of these processes requires data

conversion and manipulation.

An image seen on a computer monitor relies on the monitor's ability to reproduce the image and

represent colors within it. Adjustments such as brightness, color and contrast also tailor the

image to the preference of the viewer rather than a display of true color. The data sent to the

printer may not be adjusted to allow for imperfections in the toners used.

These differences in monitors and printers can to a large extent be reconciled through the use

of Color Management Systems.

Specifying Color

There are many ways to specify color and many models to use, including:

 HSL

 RGB

 HSB

 CMY[K]

 CIE Yxy

 CIELAB and CIELUV

 YCC

Each of these models have their advantages and disadvantages and are useful in particular

situations. We will only discuss the first two here.

The HSL Model

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