Corel PaintShop Pro X7, DE User's Guide download pdf (Page 202)

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198 Corel PaintShop Pro X7 User Guide

2Type or set a value for pixel lightness in the Threshold control to

specify which pixels to change to white (those above the

threshold) and which pixels to change to black (those below the

threshold).

Values range from 1 to 255. Lower values produce more white

pixels; higher values produce more black pixels.

3 Click OK.

You can use the zoom control in the dialog box to set your view

of the image in the Before and After panes.

Adjusting hue and saturation

Saturation is the purity or vividness of a color, expressed as the absence

of white. A color with 100% saturation contains no white. A color with

0% saturation corresponds to a shade of gray. A hue is the property

that defines a particular color. For example, blue, green, and red are all

hues.

Hue refers to the actual color (such as red or yellow). Saturation is the

vividness of the color. Imagine bright orange, which is a highly

saturated color. As the saturation is reduced (keeping the hue and

lightness unchanged), the orange color becomes brownish, then

taupe, and finally a middle neutral gray (after the saturation has been

reduced to zero). Reducing the saturation drains the color away,

leaving just the grayscale component. Taupe and mauve are low-

saturation colors because they are quite neutral, with just a touch of

color. Apple red and banana yellow are high-saturation colors.

Saturation is a measure of how different a color is from a neutral gray

of the same brightness.

In digital images, increasing the saturation can give the image brilliant

color and “punch,” but too much saturation distorts colors and causes

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Corel PaintShop Pro X7, DE User's Guide Page 202

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