The Background Eraser tool turns color pixels to transparent pixels so that you can easily remove an object from its background. With careful use, you can maintain the edges of the foreground object while eliminating background fringe pixels.
The tool pointer
is a circle with a cross hair indicating the tool’s hotspot . As
you drag the pointer, pixels within the circle and of a similar
color value as the pixel under the hotspot are erased. If the circle overlaps
your foreground object, and it doesn’t contain pixels similar to
the hotspot pixel, the foreground object won’t be erased.