Corel Painter Help | Applying Glass Distortion

Quick links to procedures on this page:

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To apply glass distortion by using paper luminance

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To apply glass distortion by using 3D brushstrokes

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To apply glass distortion by using image luminance

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To apply glass distortion by using clone or pattern luminance

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To apply glass distortion by using layer mask or channel luminance

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Glass Distortion controls

Applying Glass Distortion

The Glass Distortion effect creates the kind of distortions you would see if you were looking at your image through a sheet of glass. You can make your image appear as if it is behind the pebble glass of a shower door, or you can distort your image beyond recognition.

Glass Distortion works by relocating the pixels of the image based on a displacement map. The map is created by combining displacement information from a source with a preset map type.

Before (left) and after (right) applying Glass Distortion.

There are five sources of displacement information:

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Paper uses the information in a paper texture to displace pixels. More displacement is applied to light areas of the texture, and less to dark areas. Paper texture is good for creating the pebbled glass effect. Unless you want frosted glass, you’ll probably want to increase the scale of the paper.

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3D Brushstrokes uses the difference in luminance between the brushstrokes applied to the clone and the current document

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Image Luminance uses the light and dark areas in the current document to determine the intensity of distortions

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Original Luminance uses the clone source’s luminance. Use a tessellation as the clone source to produce a bumpy glass effect.

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[Alpha channel] or [Layer mask] uses the luminance of a channel or layer mask. More distortion appears in the light areas of the channel. You must have a saved alpha channel or layer mask to use this source.

To create a controlled distortion map, choose an alpha channel or a layer mask as a source. For example, gradations in the channel lead to a progressive distortion effect. Shapes in the channel produce distortions with distinct outlines.

To apply glass distortion by using paper luminance

Choose Window

Paper Panels

Papers.

Choose a paper swatch from the Papers library panel.

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.

Choose Effects

Focus

Glass Distortion.

Choose Paper from the Using list box.

Adjust any of the Glass Distortion controls. For information, see Glass Distortion controls.

To apply glass distortion by using 3D brushstrokes

Open an image.

Choose File

Clone.

Apply brushstrokes to the clone.

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.

Choose Effects

Focus

Glass Distortion.

Choose 3D Brush strokes from the Using list box.

Adjust any of the Glass Distortion controls. For information, see Glass Distortion controls.

To apply glass distortion by using image luminance

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.

Choose Effects

Focus

Glass Distortion.

Choose Image Luminance from the Using list box.

Adjust any of the Glass Distortion controls. For information, see Glass Distortion controls.

To apply glass distortion by using clone or pattern luminance

Do one of the following:

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To use a clone source, choose Window

Clone Source. In the Clone Source panel, click the Open Source Image button

, and Open Source to choose a clone source.

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To use a pattern, choose Window

Media Library Panels

Patterns, and click a pattern swatch from the Pattern library panel.

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.

Choose Effects

Focus

Glass Distortion.

Choose Original Luminance from the Using list box.

Adjust any of the Glass Distortion controls. For information, see Glass Distortion controls.

To apply glass distortion by using layer mask or channel luminance

Do one of the following:

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To use a layer mask, choose Window

Layers, and click the layer that contains a layer mask in the Layers panel.

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To use an alpha channel, choose Window

Channels, and click the alpha channel in the Channels panel.

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.

Choose Effects

Focus

Glass Distortion.

Choose Original Luminance from the Using list box.

Adjust any of the Glass Distortion controls. For information, see Glass Distortion controls.

Glass Distortion controls

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Softness — controls the transitions between displaced colors

Increasing the Softness setting creates more intermediate steps, which produces a smoother distortion. If you experience aliasing in a glass distortion, try increasing the Softness setting.

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Refraction (Map type) — displaces pixels in the same way that an optical lens bends light. This is the best map type for creating distortions that you’d expect from looking through glass.

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Vector Displacement (Map type) — moves pixels in a specific direction

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Angle Displacement (Map type) — moves pixels in different directions. Increasing the Softness value by a small amount (from 0 to 0.1) with this map type produces dramatic changes in the glass distortion.

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Amount — controls the degree of displacement. Moving the slider to the right increases the distortion.

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Variance — creates multiple variations in the neighborhood of the displacement. The result of increasing variance depends on the type of image and other settings.

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Direction — controls the direction of displacement. The 3 o’clock position corresponds to 0°. The Refraction map type is not dependent on direction.

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Inverted — inverts the selected source

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Quality — changes the quality of the distortion

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