The Minimax effect assigns each channel of a pixel the minimum or maximum value for that channel found within a specified radius.

This effect can be used to enlarge or reduce a matte. For example, a white solid area surrounded by black shrinks one pixel on each side using Minimum and a radius of 1.

The layer’s quality setting doesn’t affect Minimax.

This effect works with 8-bpc and 16-bpc color.

Operation

Minimum assigns each channel of a pixel the minimum value for the specified channel within the specified radius. Maximum assigns each channel of a pixel the maximum value. Minimum Then Maximum performs the Minimum operation and then the Maximum operation. Maximum Then Minimum performs the Maximum operation and then the Minimum operation.

Direction

The axis along which to scan for values. Horizontal & Vertical scans all directions.