PURPOSE: To accurately correct a line width by counting backward a coordinate value and a distance in a left end in a varied power outline point to data at the time of design, and after varying power the coordinate adding the distance to the coordinate, performing hinting process and performing rounding process the coordinate value after varied power at a right end in the outline point.

CONSTITUTION: The number of points of the outline points in outline data are set to numpoint (101), and n is made zero (102), and unless n exceeds numpoint (103), when the outline point in the outline data exists the left end of a vertical stem (104), hinting process is performed (105). Then, when at the right end of the vertical stem (106), an X coordinate is rounded (107). When nothing, that is, related to an inclined line and a curve, other hinting process is performed (108). The next point is made n+1 (109), by repeating the above- mentioned step processes, all outline points in the outline data are processed.