| 摘要 |
PROBLEM TO BE SOLVED: To provide a picture forming device in which a load required for the plotting of gradation can be greatly reduced, and a high speed operation can be attained. SOLUTION: A plotting part 13 performs plotting by using plotted data held in a plotted data holding part 12, and writes the data in a page buffer 15. And, when the generation of gradation is instructed, the plotting part 13 calls a gradation generating part 14. The gradation generating part 14 uses a vector in the direction of change of a transferred color and the information of colors at the start and end points, sets plural adjacent band-shaped areas vertical to a straight line connecting the start point with the end point whose inside color values are made uniform, and finds a cross point between the boundary of the band-shaped area and a scanning line as the changing point of the color. The changing point of the color and a color between the changing points are sequentially found for each scanning line so that the gradation pattern of the scanning direction can be formed. |
