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Japanese comic, or manga, is a popular art form over the world. Screening refers to the process of laying pre-printed patterns (can be regular or irregular) over a region. Manga artists usually lay screens not solely according to shading (tone), but also the texture, material property, or even the chromaticity of the underlying surface being expressed. Such a screening process is tedious and labor intensive. The situation is even worse for complicated backgrounds. To save time and cost, some artists have already adopted computerized methods.
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