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Revisiting Categorical Color Perception in Scatterplots: Sequential, Diverging, and Categorical Palettes (2404.03787v2)

Published 4 Apr 2024 in cs.HC

Abstract: Existing guidelines for categorical color selection are heuristic, often grounded in intuition rather than empirical studies of readers' abilities. While design conventions recommend palettes maximize hue differences, more recent exploratory findings indicate other factors, such as lightness, may play a role in effective categorical palette design. We conducted a crowdsourced experiment on mean value judgments in multi-class scatterplots using five color palette families--single-hue sequential, multi-hue sequential, perceptually-uniform multi-hue sequential, diverging, and multi-hue categorical--that differ in how they manipulate hue and lightness. Participants estimated relative mean positions in scatterplots containing 2 to 10 categories using 20 colormaps. Our results confirm heuristic guidance that hue-based categorical palettes are most effective. However, they also provide additional evidence that scalable categorical encoding relies on more than hue variance.

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Authors (4)
  1. Chin Tseng (5 papers)
  2. Arran Zeyu Wang (10 papers)
  3. Ghulam Jilani Quadri (16 papers)
  4. Danielle Albers Szafir (21 papers)
Citations (2)

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