The present invention relates to a callus-removing skin-file capable of removing fingernails, toenails, calluses and the like and a method of manufacturing the same. The container has a hemispherical shape. The method calculates the difference between the expected value for the light pixels and the expected value of the dark pixels in the reference image. Some of the water produced may also be run back through the separation means to help clean out the crud. The rise and the fall time of the illumination waveform are independently controlled. Therefore, the object may be added to a database of objects distributed among a plurality of data processing systems and accessed by an application communicating, when bandwidth is available, with other data processing systems over the Internet.