Bump Map

Use Bump Map to simulate the look of a raised or bumpy surface on the current layer using another layer's pixels as a source. In fact, the source for the bump map can be any operator in the workspace. The result looks like the source layer is embossed or stamped onto the surface of the current layer, complete with bright highlights on raised points.

In the following illustration, the top image is used as a source for a bump map applied to a solid white layer. The bottom image shows the result.

Layer

Determines the source operator for the bump map. Choose from any of the operators in the workspace.

Channel

Determines the channel to use as a source. The default value is Luminance.

Height

Controls the height of the bumps. Positive values create raised bumps, while negative values create recessed bumps.

Smoothness

Specifies the smoothness of the bumps. Increase the smoothness to blur the bump map before applying it to the layer.

Ambient

Controls the amount of ambient light striking the layer.

Diffuse

Specifies how light spreads over the surface of the bumps. The higher the diffuse value, the more evenly the light is spread.

Specular and Shininess

Modify the highlights created when the imaginary light source hits a raised point:

• Specular controls the brightness of the highlights.
• Shininess controls the spread of the highlights. A high value creates small, tightly focused highlights on the edges of the bumps, while a low value creates wide highlights.

Source Latitude

Determines the X direction of the imaginary light source.

Source Longitude

Determines the Y direction of the imaginary light source.

Source Color

Specifies the color of the light source. Click the color box to choose a color from the Pick Color dialog, or click the Color Picker tool to pick a color from the image.