APPARATUS FOR, AND METHOD OF, FORMING PARENTHESIZED IMAGE; APPARATUS FOR, AND METHOD OF, FORMING EXTERNALLY FRAMED IMAGE; PROGRAM; AND MEMORY MEDIUM

Outline font data showing the original outside shape having a single closed curve made up of a parenthesized outside shape portion of the parenthesized image and a connecting line portion to connect both open ends is stored. The height and line width are determined. Based on the above data, a first-size solidly shaded image is formed having the determined height and is entirely filled inside the original outside shape thereof with effective pixels of logic “1.” A second-size solidly shaded image is formed of a second size which is smaller by the line width than the first-size solidly shaded image, along the parenthesized outside shape portion. Non-equivalence operation is performed with corresponding pixels by displacing the first-size solidly shaded image and the second-size solidly shaded image by the line width along the parenthesized outside shape portion.