Bitmap Eraser Options
The bitmap eraser options are identical to those of the bitmap brush with one obvious exception. Instead of customizing the parameters of a mark or stroke, you will be customizing the parameters for the absence of a mark or stroke.
It is a good idea to create an eraser preset with the identical properties of a brush preset and to use them as a pair. That way, when part of a stroke is erased, its soft textured look is not interrupted with a hard edged eraser mark.
For information on bitmap brushes, see Bitmap Brush Tool Options