Hue preserving color blending

Hue-Preserving Color Blending Johnson Chuang1, Daniel Weiskopf 2, Torsten Möller1 GrUVi Lab Simon Fraser University Canada VISUS Universität Stuttgart Germany Overview     Motivation Background & Related Work Design & Mechanics Results Motivation  Color and transparency are crucial in visualization  Color labelling of differently classified materials vol data ♦ Region ♦ Region ♦ Region 3 Background  Perceptual transparency is affected by: • Luminance Background  Perceptual transparency is affected by: • Luminance Background  Perceptual transparency is affected by: • Luminance • Chromaticity Background  Perceptual transparency is affected by: • Luminance • Chromaticity • Part boundaries • Motion • … Related Work  Wang et al., Color Design for Illustrative Visualization, Vis’08 • Reduce false colors by using opposite colors Image source: Wang et al (Vis’08) Goals  A complete computational and parameter free model for generic image compositing • No constraints on color choices • Guarantee hue preservation for color overlays Design of Hue-Preserving Color Blending 10 Traditional Hue-Preserving 27 Drawbacks Traditional Hue-preserving 28 Drawbacks  Gray color is ambiguous Traditional Hue-preserving 28 Drawbacks  Gray color is ambiguous Traditional Hue-preserving 28 Drawbacks  Gray color is ambiguous Traditional Hue-preserving 28 Drawbacks  Gray color is ambiguous Traditional Hue-preserving 28 Drawbacks  Gray color is ambiguous Traditional Hue-preserving 28 Drawbacks  Gray color is ambiguous Traditional Hue-preserving 28 Drawbacks  Gray color is ambiguous Traditional Hue-preserving 28 Drawbacks  Gray color is ambiguous Traditional Hue-preserving 28 Drawbacks  Gray color is ambiguous Traditional Hue-preserving  Hue-preserving blending is order-dependent 28 Future Direction  User study • To empirically evaluate our method • To optimize transparency perception  Applications outside direct volume visualization 29 Summary  A new color blending technique that preserves the input hues • Achromatic channel completely preserved • Chromatic channel favors dominant hue  Motivated by perceptual principles  No restrictions on input color hues  Improves visual color labelling of volume data when using colors that are similar in hue 30 Thank You!  Questions? Comments?  Acknowledgments • Anonymous reviewers • NSERC Canada • GrUVi Lab at SFU Traditional C1 Hue-preserving C2 Cnew C’1 31 ... Traditional Hue- preserving 22 Traditional Hue- preserving 22 Traditional Hue- preserving 23 Traditional Hue- preserving 23 Traditional Hue- preserving 24 Traditional Hue- preserving 25 Traditional Hue- preserving. .. artificial color discontinuities 10 Mechanics of Hue- Preserving Color Blending 11 Mechanics of Hue- Preserving Color Blending  Traditional color summation operator: “+” 11 Mechanics of Hue- Preserving Color. .. compositing • No constraints on color choices • Guarantee hue preservation for color overlays Design of Hue- Preserving Color Blending 10 Design of Hue- Preserving Color Blending  observations: • Luminance