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Scratch art is an artwork created by scratching on the black paint. After scratching, a part of the colorful background is emerging appear from the scratched region. Existing digital painting software enables to make some artworks including the scratch art. However, novice users are too hard to use the software. If users can color the scratch art easily, they may find their own artistic expressions and facilitate to participate in some art activities. This study presents a digital scratch art painting interface using a blob-based method proposed by Shugrina et al. The interface allows users to color by their sketches and then the gradient colors are generated automatically. Furthermore, users are possible to edit each color blob, in fact, every blob is movable and changeable its sizes. We also adopt a kubelka-munk model to mix colors based on real pigments. To verify the effectiveness of the proposed interface, we conducted the experimental evaluation. The experimental results confirmed that the usability of the proposed interface is superior to the existing painting software. This paper describes the details of the proposed interface and the experimental results.
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