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Selection > Soften Selection Edges

Soften Selection Edges

You can soften selection edges by using anti-aliased or feather.

Anti-aliased

When you make a selection of ellipse, polygon, or by-color, due to the slope of the segment, some pixels are on both

sides of the segment. That is, these pixels are only partially selected. What happens to this set of partially selected

pixels is determined by the Antialiasing option. If Antialiasing isn't checked off, we will include pixels in the selection

when more than 50% of the pixel is in the selection and unselected otherwise. Actually no matter what percentage

you use to include or exclude the pixel, the segment produces a staircase effect on the edge.

If you check off Antialiasing option, the partially selected pixels will be represented by the level of gray indicating the

percentage of the pixel that falls inside the selection. Assigning gray values to partially selected pixels has the effect

of visually smoothing the staircase effect. This level of gray in the edge of the selection applies on painting, drawing,

or processing to the selected area image to produce smooth edges.

Feather Feathering is a selection edge treatment similar to Antialiasing to produce smooth edges. It works by

changing the level of gray of their radial distance from the selection edge. The Feather Radius in pixels determines

the rate at which the gray level changes.

You can change the Feather Radius after the selection complete by using the menu item Select/Feather to change the

radius of feathering. However, you can't change the Antialiasing of the selection after completion.

Tolerance

The Fuzzy Select tool uses this option. It uses the tolerance value to include or exclude the neighboring pixels in the

selection. The value can be from 0 to 255.