"Border" allows you to "soften" the mask edges. Increasing the border value creates round soft
gradient edges as shown below.
The Border value ranges from 0 to 100. Use the slider or left and right arrow keys to change the value.
Invert, when turned ON, reverses the default garbage mask (swapping its opaque and transparent
areas). This means that by enabling Invert, the transparent area is the border and the central area
is blocked.
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