Corel PaintShop Pro X7, DE User's Guide download pdf (Page 653)

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Working with advanced color features 649

color wheel. On the Color page’s Color wheel, colors are assigned

counter-clockwise from the top. Red is at the top (value 0) and as

you move around the wheel the colors go through orange, yellow,

green, blue, purple, and back to red.

• Saturation — the purity or vividness of the color. Saturation

represents the amount of gray in the color, from 0 (entirely gray)

to 255 (fully saturated color).

• Lightness — the perceived amount or intensity of light in the

color. Lightness ranges from 0 (no light, or black) to 255 (total

lightness, or white). At 50 percent lightness, or a value of 128, a

color is considered pure. For example, pure red has a hue of 255,

a saturation of 255 (100 percent) and a lightness of 128 (50

percent). For pure blue, the hue is 170, saturation is 255 and

lightness is 128.

CMYK model

The CMYK model is based on the fact that ink on paper both absorbs

and reflects light. As white light strikes the ink, part of the color

spectrum is absorbed and part is reflected back to your eyes (resulting

in the color you see).

In this model, the primary colors cyan (C), magenta (M), and yellow (Y)

combine in varying proportions to produce a variety of colors. When

the three colors are combined, they produce black. Because impurities

in the ink make it difficult to produce a true black, a fourth color, black

(K), is added.

Combining inks in this way is called four-color process printing. It is

used by printing services and high-end color printers.

Although you cannot create images in Corel PaintShop Pro using the

CMYK model, you can produce color separations that can be printed

on CMYK printers. There are two ways to do this: You can split the

images into CMYK channels, or you can print color separation pages.

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Corel PaintShop Pro X7, DE User's Guide Page 653

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