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Principles of Color
Published in Terry A. Slocum, Robert B. McMaster, Fritz C. Kessler, Hugh H. Howard, Thematic Cartography and Geovisualization, 2022
Terry A. Slocum, Robert B. McMaster, Fritz C. Kessler, Hugh H. Howard
The colors that we perceive are a function of two theories of color perception. The trichromatic theory states that color perception is a function of the relative stimulation of the blue, green, and red cones. The opponent-process theory states that color perception is based on a lightness-darkness channel and two opponent channels: red–green and blue–yellow. The blue–yellow channel is excited by green and red cones and inhibited by blue cones; the red-green channel is excited by red cones and inhibited by green cones; and red, green, and blue cones stimulate the lightness–darkness channel.
Toward an information theoretic ontology of risk, resilience and sustainability and a blueprint for education - part II
Published in Sustainable and Resilient Infrastructure, 2022
Linda Nielsen, Michael Havbro Faber
Figure 4 provides a visual illustration of the ontology as a nested hierarchy, comprised of the elements concept, concept cluster, dimension, and dimensional pair. The color scheme is based on Opponent Process Theory of Color Vision (Hering, 1964). Visualization is a significant part of both the ontology and blueprint design. The use of color is not arbitrary and it aims to convey some of the logical principles of the design to potential end-users. In Nielsen (Nielsen & Faber, 2020) the principles and rules of visualization for the purpose of communicating design choices in the ontology and blueprint are discussed in terms of a visualization grammar that explains the choices for graphical elements (marks and symbols) and categorical and relational attributes (color hue, color saturation, and part-whole containment).