Pastel painting is a very expressive way of painting.This paper presents a non-photorealistic rendering method for pastel-simulation based on input images.The simulation is carried out in two stages

namely foundation-laying and refinement.In the foundation-laying stage

the input image is segmented by a mean-shift segmentation method to obtain regions and their colors.The vector field is calculated within the regions to determine the direction of strokes.Controlled by the above information

the foundation-laying stage is completed by simulating line-rendering and side-rendering techniques.In the refinement stage

prominent features are located in the reference image using the coherent line drawing method

and simulated with stipple-rendering in the pastel.Experiment results demonstrate that the two-stage process proposed in this paper transfers reference images quickly and efficiently into their pastel simulations.