Human Perceptual Abilities
Outline
Why Study Color?
Visible Spectrum
Human Visual System
Retina
Color Perception via Cones
Color Sensitivity
Distribution of Photopigments
Color Sensitivity & Image Detection
Color Sensitivity (cont.)
Focus
Color Deficiency (also known as “color blindness”)
What is Wrong with this Design?
Color Components
Color Components (cont.)
Color Guidelines
Pick Non-adjacent Colors on the Hue Circle
Color Guidelines (cont.)
Color Summary
Preattentive Processing
Example: Color Selection
Example: Shape Selection
A live demonstration
Pre-attentive Processing
Example: Conjunction of Features
Example: Form vs. Hue
Example: Hue vs. Brightness
More on Conjunctive Searches
Asymmetric and Graded Preattentive Properties
NOT Preattentive: Meaning Represented by Text
Preattentive Visual Properties (Healey 97)
Visual Illusions
Illusions of Linear Extent
Illusions of Area
Gestalt Properties
Gestalt Laws of Perceptual Organization (Kaufman 74)
More Gestalt Laws
M.C. Escher “Heaven and Hell”
Visual Illusion Using Gestalt Properties
Which Properties for What Information Types?
Accuracy Ranking of Quantitative Perceptual Tasks (Mackinlay 88 from Cleveland & McGill)
Interpretations of Visual Properties
Example: Putting It Together (Healey 98)
What’s Wrong with this Picture?
Next Time
Email: hearst@sims.berkeley.edu
Home Page: http://sims.berkeley.edu/~hearst
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