5

You can feather mask edges outward or inward. The direction in which you feather a
mask is dictated by the subject you’re masking. When rotoscoping a subject, a combination
of inward and outward feathered masks may be necessary for the best results.
Feathered in (color channel)
Feathered in (alpha channel)
Feathered out (color channel)
Feathered out (alpha channel)
To feather the edge of a mask
1 Select a mask.
2 Open the Mask Inspector.
3 Do one of the following:
• Drag the Feather value slider to the right for a positive value to feather the mask
outward.
• Drag the Feather value slider to the left for a negative value to feather the mask inward.
Applying Filters to Masks
As with shapes, you can apply filters to masks, which remain editable even after the
application. It’s an extremely powerful way to further manipulate the alpha channel
created by a mask.
1205Chapter 20 Using Shapes, Masks, and Paint Strokes