Corel Painter Help | Applying Highpass

Quick links to procedures on this page:

•

To apply a Highpass effect

Applying Highpass

The Highpass effect suppresses low-frequency areas containing gradual or smooth transitions of brightness levels. This leaves high-frequency areas, or just the edges of an image, containing stark shifts between brightness levels.

Highpass uses either the Gaussian or Circular aperture options. Gaussian aperture affects the red, green, and blue components of color; Circular aperture uses image luminance. You can make the highpass more pronounced by using the Equalize effect.

highpass

The Highpass effect introduces stark shifts between brightness levels.

To apply a Highpass effect

1

To apply the effect to:

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The canvas — Click the Canvas in the Layers panel.

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A selection — Click a selection tool from the toolbox, and drag in the document window to select an area.

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A layer — Click a layer in the Layers panel.

2

Choose Effects

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Highpass.

3

In the Highpass dialog box, choose an aperture option.

4

Move the Amount slider to determine how much to suppress the low-frequency areas.

This value defines a radius, in pixels, around each pixel in the selected image area. Moving the slider to the left suppresses larger amounts of low-frequency information. Moving the slider to the right suppresses smaller amounts of low-frequency information.

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