Channel > Minimax effect

The Minimax effect enlarges or reduces a matte for a specific channel or all channels. It assigns each pixel the minimum or maximum pixel value found within a specified radius. For example, a white solid layer with a square mask shrinks one pixel on each side using Minimum and a radius of 1. The layer's quality setting does not affect Minimax.


Original (left); with Operation set to Maximum, Channel set to Green, and Direction set to Vertical (center); Operation set to Maximum Then Minimum, Radius set to a low value, and Channel set to Color (right)

Adjust the following controls for the Minimax effect:

Operation

Specifies how the effect processes the matte. Minimum replaces a pixel with the smallest pixel value within the radius specified, and Maximum replaces a pixel with the largest pixel value within the radius specified. Minimum Then Maximum performs the Minimum operation on the layer followed by the Maximum operation using the Radius setting, and Maximum Then Minimum does the opposite.

Radius

Specifies how many pixels to examine for the Minimum or Maximum operation.

Channel

Specifies the channel. Color affects the color channels only. Alpha and Color affects all channels. Red, Green, Blue, and Alpha affect only the respective channels.

Direction

Specifies the direction of scanning for values. Horizontal & Vertical scans all directions for the minimum or maximum pixel. Just Horizontal and Just Vertical scan only left and right or up and down, respectively.