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Displacement Map (Pro only)
The Displacement Map effect distorts a layer by displacing pixels horizontally and vertically based on the color values of pixels in a second layer, called the displacement map. The type of distortion created by the Displacement Map effect can vary greatly, depending on the displacement map and options you select.
The displacement is determined from the color values of the displacement map. The color values range from 0 to 255. Each value is converted into a scale ranging from -1 to 1. The displacement amount is calculated by multiplying the converted value by the maximum displacement amount you specify. A color value of 0 produces maximum negative displacement (-1 maximum displacement). A color value of 255 produces maximum positive displacement. A color value of 128 produces no displacement. For other values, you can calculate the displacement amount, in pixels, using the following equation: Displacement amount = maximum_displacement * (2 * (color value - 128)/256)
To displace an image:
- Select the layer, and choose Effect > Distort > Displacement Map.
- In the Effect Controls window, choose the layer to use as the displacement map from the Displacement Map Layer pop-up menu. After Effects uses the layer in its original form, without any masking, effects, or transformations you may have applied. If you want to include those alterations, precompose that layer using the Move All Attributes Into the New Composition option.
- Choose the channel to use for horizontal displacement and vertical displacement, and enter a maximum displacement value for each in the Effect Controls window.
- Choose a behavior from the Displacement Map Behavior pop-up menu:
- Center Map overlays the displacement map over the layer.
- Stretch Map to Fit resizes the displacement map to the layer's size.
- Tile Map fills the layer with as many copies of the map as can fit.
- In Edge Behavior deselect Wrap Pixels Around to halt the displacement at the edge of the image.