While pursuing photorealistic rendering has been the main purpose in the computer graphics society for several decades, non-photorealistic rendering, formally appeared about a decade ago, has also found its use in numerous applications. The popularity of non-photorealism can be mainly attributed to its simplicity, which as a result leads to aesthetics and succinctness. Reality often presents too many details and too much complexity, thus offsetting the observation of the essence of objects. Based on a similar belief, impressionism focuses primarily on conveying the interaction of lights and shadows, without emphasizing the fine details of a scene. In recent years, there have been several successful researches on simulating impressionism with computers, and some of them claimed themselves capable of mimicking different styles of impressionism. Among the various styles of impressionism, we are particularly interested in simulating the style of pointillism, especially the style presented by Georges-Pierre Seurat, as he was deemed the founder of pointillism. To achieve simulating Seurat’s painting style, we made careful observations on all accessible Seurat’s paintings and extract from them some important features, such as the few primitive colors, point sizes, and the effects of complementary colors and halos. These features have been successfully simulated and results are compared with not only Seurat’s existing paintings, but also with previous attempted simulations.