Abstract
A lot of Non-Photorealistic Rendering methods have been proposed for creating artistic images from a 2D image. In this paper, we propose a method for creating colored-pencil drawings. Although colored-pencil drawings are drawn with limited number of pencils, we can express a lot of colors and gentle textures by changing the strength when drawing strokes and by overlapping strokes of different colors. In order to realize these features, we first determine the colors and the strengths to draw strokes, then draw several types of strokes, such as strokes for outlines, basecoats, and shading, allowing the strokes to overlap each other. When we create strokes for shading, we make their directions to align along the boundaries of regions, resulting in images that are more like the drawings made by artists.
