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and a B value of 50. When the values of all three components are equal, the

result is a shade of neutral gray. When the value of all components is 255, the

result is pure white; when the value is 0, pure black.

RGB images use three channels to reproduce up to 16.7 million colors

on-screen. In addition to being the default mode for new ToupView images, the

RGB mode is used by computer monitors to display colors. This means that

when working in color modes other than RGB, such as CMYK, ToupView uses

RGB mode for display on-screen.

Although RGB is a standard color mode, the exact range of colors represented

can vary, depending on the application or display device.

CMYK

The CMYK mode is based on the light-absorbing quality of ink printed on

papers. As white light strikes translucent inks, certain visible wavelengths are

absorbed while others are reflected back to the eyes.

In theory, pure cyan (C), magenta (M), and yellow (Y) pigments should

combine to absorb all light and produce black. For this reason these colors are

called subtractive colors. Because all printing inks contain some impurities,

these three inks actually produce a muddy brown and must be combined with

black (K) ink to produce a true black. (K is used instead of B to avoid confusion

with blue.) Combining these inks to reproduce color is called four-color process

printing.

The subtractive (CMY) and additive (RGB) colors are complementary colors.

Each pair of subtractive colors creates an additive color, and vice versa.

HSI

Based on the human perception of color, the HSI model describes three

fundamental characteristics of colors:

Hue is the color reflected from or transmitted through an object. It is measured

as a location on the standard color wheel, expressed as a degree between 0°

and 360°. In common use, Hue is identified by the name of the color such as

red, orange, or green.

Saturation, sometimes called chroma, is the strength or purity of the color.

Saturation represents the amount of gray in proportion to the hue, measured

as a percentage from 0% (gray) to 100% (fully saturated). On the standard

color wheel, Saturation increases from the center to the edge.