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:
•
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.
•
3D Brushstrokes uses the difference in luminance between the brushstrokes applied to the clone and the current document
•
Image Luminance uses the light and dark areas in the current document to determine the intensity of distortions
•
Original Luminance uses the clone source’s luminance. Use a tessellation as the clone source to produce a bumpy glass effect.
•
[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
1
Do one of the following:
•
On the
Brush tool
![](../Shared_graphics/Brush.svg)
property bar, click the
Paper Selector flyout button
![](../Shared_graphics/Corel-Painter-paper-selector.jpg)
.
•
Choose
Window
Media Panels
Papers to open the
Papers panel.
2
Click a paper texture swatch in the
Paper Textures area.
3
To apply the effect to:
•
The canvas — Click the
Canvas in the
Layers panel.
•
A selection — Click a selection tool from the toolbox, and drag in the document window to select an area.
•
A layer — Click a layer in the
Layers panel.
4
Choose
Effects
Focus
Glass Distortion.
5
Choose
Paper from the
Using list box.
To apply glass distortion by using 3D brushstrokes
2
Choose
File
Clone.
3
Apply brushstrokes to the clone.
4
To apply the effect to:
•
The canvas — Click the
Canvas in the
Layers panel.
•
A selection — Click a selection tool from the toolbox, and drag in the document window to select an area.
•
A layer — Click a layer in the
Layers panel.
5
Choose
Effects
Focus
Glass Distortion.
6
Choose
3D Brush strokes from the
Using list box.
To apply glass distortion by using image luminance
1
To apply the effect to:
•
The canvas — Click the
Canvas in the
Layers panel.
•
A selection — Click a selection tool from the toolbox, and drag in the document window to select an area.
•
A layer — Click a layer in the
Layers panel.
2
Choose
Effects
Focus
Glass Distortion.
3
Choose
Image Luminance from the
Using list box.
To apply glass distortion by using clone or pattern luminance
1
Perform a task from the following table.
|
|
|
In the Clone Source panel ( Window Clone Source), choose Embedded Image from the Source list box.
In the Embed Source Image dialog box, do one of the following:
• To browse for a file, enable the Browse option.
• To clone a currently open document, enable the Current Document option, and choose a document from the list box.
• To embed the active texture, enable the Current Texture option.
|
|
Choose Window Media Panels Patterns, and click a pattern swatch in the Painter Patterns area.
|
2
To apply the effect to:
•
The canvas — Click the
Canvas in the
Layers panel.
•
A selection — Click a selection tool from the toolbox, and drag in the document window to select an area.
•
A layer — Click a layer in the
Layers panel.
3
Choose
Effects
Focus
Glass Distortion.
4
Choose
Original Luminance from the
Using list box.
To apply glass distortion by using layer mask or channel luminance
1
Do one of the following:
•
To use a layer mask, choose
Window
Layers, and click the layer that contains a layer mask in the
Layers panel.
•
To use an alpha channel, choose
Window
Channels, and click the alpha channel in the
Channels panel.
2
To apply the effect to:
•
The canvas — Click the
Canvas in the
Layers panel.
•
A selection — Click a selection tool from the toolbox, and drag in the document window to select an area.
•
A layer — Click a layer in the
Layers panel.
3
Choose
Effects
Focus
Glass Distortion.
4
Choose
Original Luminance from the
Using list box.
Glass Distortion controls
•
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.
•
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.
•
Vector Displacement (
Map type) — moves pixels in a specific direction
•
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.
•
Amount — controls the degree of displacement. Moving the slider to the right increases the distortion.
•
Variance — creates multiple variations in the neighborhood of the displacement. The result of increasing variance depends on the type of image and other settings.
•
Direction — controls the direction of displacement. The 3 o’clock position corresponds to 0°. The Refraction map type is not dependent on direction.
•
Inverted — inverts the selected source
•
Quality — changes the quality of the distortion