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RealPigment: paint compositing by example

Author(s): Lu, Jingwan; DiVerdi, Stephen; Chen, Willa A; Barnes, Connelly; Finkelstein, Adam

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Abstract: The color of composited pigments in digital painting is generally computed one of two ways: either alpha blending in RGB, or the Kubelka-Munk equation (KM). The former fails to reproduce paint like appearances, while the latter is difficult to use. We present a data-driven pigment model that reproduces arbitrary compositing behavior by interpolating sparse samples in a high dimensional space. The input is an of a color chart, which provides the composition samples. We propose two different prediction algorithms, one doing simple interpolation using radial basis functions (RBF), and another that trains a parametric model based on the KM equation to compute novel values. We show that RBF is able to reproduce arbitrary compositing behaviors, even non-paint-like such as additive blending, while KM compositing is more robust to acquisition noise and can generalize results over a broader range of values.
Publication Date: Aug-2014
Citation: Lu, Jingwan, Stephen DiVerdi, Willa A. Chen, Connelly Barnes, and Adam Finkelstein. "RealPigment: paint compositing by example." Proceedings of the Workshop on Non-Photorealistic Animation and Rendering (2014): pp. 21-30. doi:10.1145/2630397.2630401
DOI: 10.1145/2630397.2630401
Pages: 21 - 30
Type of Material: Conference Article
Journal/Proceeding Title: Proceedings of the Workshop on Non-Photorealistic Animation and Rendering
Version: Author's manuscript

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