Anti-Alias Filter
The anti-alias filter will “soften” hard edges in the selected area. In reality (as far as I know) it’s not possible to do TRUE antialiasing in this way. This requires knowledge of the theoretical shape of an object, which is not what a bitmap provides, but this filter is effective enough.
The
anti-alias filter produces a very subtle effect, but it should be just about
visible in this example. Note that this
image is a Jpeg, which goes some way to hiding the effect.
Information on using the: Filter Tool