Serif ECD518624M Datasheet download pdf (Page 49)

Manipulating Images 41

Soft-edged and hard-edged selections

Antialiasing and feathering are different ways of controlling what happens at

the edges of a selection. Both produce softer edges that result in smoother

blending of elements that are being combined in the image. You can control

either option for the Standard and Adjustable Selection tools, using the Feather

input box (or slider) and Antialias check box on the Context toolbar.

• Antialiasing produces visibly smooth edges by making the selection's

edge pixels semi-transparent. (As a layer option, it's not available on

the Background layer, which doesn't support transparency.)

• If an antialiased selection (for example, one pasted from another

image) includes partially opaque white or black edge pixels, you can

use the Matting command on the Layers menu to remove these pixels

from the edge region, yielding a smoother blend between the selection

and the image content below. (Fully opaque edge pixels are not

affected.)

• Feathering reduces the sharpness of a selection's edges, not by varying

transparency, but by partially selecting edge pixels. If you lay down

paint on a feathered selection, the paint will actually be less intense

around the edges. You can apply feathering "after the fact" to an

existing selection (but before applying any editing changes) using the

Select menu's Modify>Feather... command. In the dialog, enter the

width (in pixels) of the transition area. A higher value produces a

wider, more gradual fade-out.

• Threshold converts a feathered, soft-edged selection into a hard-edged

selection (use Modify>Threshold). As with feathering, you won't see

an immediate effect on the image, but painting and other editing

operations will work differently inside the selection.

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Serif ECD518624M Datasheet Page 49