Contracting and Spreading Masks

In addition to the painting tools and commands that you can employ to edit masks, you can use a couple of very useful filters to contract and spread masks. Both can be found in the Filter ^ Other submenu. To contract, use Minimum; to spread, use Maximum.

Briefly, this is how they work: The Minimum filter works by contracting the white areas inward while spreading the black areas of color. The Radius value in the filter dialog box controls the amount of contraction. The Maximum filter works in the opposite way to that of the Minimum:

It spreads the white areas of color while contracting the black areas inward. One way to remember the functions of the two filters is to think of their names as describing the effect they have on the white fill. Minimum minimizes white; Maximum maximizes white.

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