Adobe 12040118 - After Effects Standard Tutorial page 507

The gradient layer can be a still image or a moving image. The gradient layer must be in the same composition as the layer to which you apply
Gradient Wipe.
You can create gradient layers in many ways, such as using the Ramp effect or creating them in Photoshop or Illustrator.
Transition Softness The degree to which the transition is gradual for each pixel. If this value is 0%, pixels in the layer to which the effect is
applied are either completely opaque or completely transparent. If this value is greater than 0%, pixels are semitransparent at the intermediate
stages of the transition.
Gradient Placement How the pixels of the gradient layer are mapped to the pixels of the layer to which the effect is applied:
Tile Gradient Uses multiple tiled copies of the gradient layer.
Center Gradient Uses a single instance of the gradient layer in the center of the layer.
Stretch Gradient To Fit Resizes the gradient layer horizontally and vertically to fit the entire area of the layer.
Invert Gradient Inverts the influence of the gradient layer; lighter pixels in the gradient layer create transparency at a lower Transition Completion
value than do darker pixels.
Iris Wipe effect
The Iris Wipe effect creates a radial transition that reveals an underlying layer. Specify the number of points used to create the iris using a range of
6 to 32 points, and specify whether an inner radius is used. If Use Inner Radius is selected, you can specify values for both Inner Radius and
Outer Radius; the iris isn't visible if Outer Radius, Inner Radius, or both are set to 0. The iris is roundest if both Outer Radius and Inner Radius are
set to the same value.
The Iris Wipe effect is the only Transition effect that doesn't have a Transition Completion property. To animate the Iris Wipe effect to expose the
underlying layers, animate the Radius properties.
This effect works with 8-bpc and 16-bpc color. In After Effects CS6, this effect works in 32-bit color.
Original (upper-left), and with effect applied (lower-left and right)
Linear Wipe effect
The Linear Wipe effect performs a simple linear wipe of a layer in a specified direction. At Draft quality, the edge of the wipe isn't anti-aliased; at
Best quality, the edge of the wipe is anti-aliased and the feather is smooth.
Wipe Angle The direction that the wipe travels. For example, at 90° the wipe travels from left to right.
This effect works with 8-bpc and 16-bpc color. In After Effects CS6, this effect works in 32-bit color.
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