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In the animation industry, the colorization of raw sketch images is a vitally important but very time-consuming task. This paper focuses on providing a novel solution that semi-automatically colorizes a set of images using a single colored reference image. Our method is able to provide coherent colors for regions that have similar semantics than the reference image. An active-learning-based framework is used to match local regions, followed by a Mixed-Integer Quadratic Programming (MIQP) that considers the spatial contexts to further re