An image processing method of making luminance correction on the basis of a luminance histogram showing luminance level distribution of image data expressing an image by a numerical value. When processing a request for a social bookmarking operation, the system searches for a URL and potentially other resource information within the document object model of a currently loaded Web page. The mirrors may be flat or bent in different instances, and may or may not be heat treated. A rinsing process is performed between the pre-polishing and the post-polishing to rinse the raw material glass plate after the pre-polishing with a washing liquid to wash away the abrasive grains collected in the polishing pad in pre-polishing during the rinsing process. The control circuitry controls the video switcher and other outputted signals based on data file information that corresponds to content of the prerecorded image or media.