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    Colormaps draped onto surfaces can lose accuracy and affect shape perception. Stepped colormaps are read more accurately but hinder shape understanding in scientific visualization.

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    Area of Science:

    • Scientific Visualization
    • Perceptual Psychology

    Background:

    • Scientific visualization commonly uses color mapping on surfaces to represent data.
    • Draping and shading can distort the perception of colormapped variables and surface shape.

    Purpose of the Study:

    • To investigate how colormap properties affect accuracy when draped and shaded.
    • To evaluate the impact of colormaps on surface shape perception.

    Main Methods:

    • Participants performed a task to identify surface features (peaks and valleys).
    • Colormap luminance and step characteristics were varied.
    • Accuracy of reading colormapped data and perception of surface shape were measured.

    Main Results:

    • Luminance variations in colormaps had less impact on shape perception than hypothesized.
    • Stepped colormaps improved data reading accuracy.
    • Stepped colormaps significantly interfered with surface shape perception.

    Conclusions:

    • The choice of colormap depends on whether data accuracy or shape perception is prioritized.
    • Careful consideration of variable importance is crucial when selecting colormaps for draped surfaces.