The document discusses optimizing colors for visualizing geographic data. It examines color models, color spaces, and metrics for quantifying color differences. An experiment used questionnaires and eye-tracking to determine what color distance is optimal for distinguishing classes of geographic data. The document also describes constructing color schemes with uniform and non-uniform color distances between classes and provides a link to software that helps create such schemes.

1. OPTIMIZING COLOURS FOR EFFECTIVE
VISUALIZATION OF GEOGRAPHIC DATA
www.geoinformatics.upol.cz
Jitka Doležalová

2. COLOUR DISTANCE
• Colour model, colour space
• Metric – quantification of the difference
between two colours
• Perceptually uniform versus non-uniform
colour model
www.geoinformatics.upol.cz

3. sRGB
www.geoinformatics.upol.cz
CIELAB

4. EXPERIMENTAL RESULTS
• Two successive phases through a
questionnaire and eye-tracking
• What colour distance is optimal?
• The distance was
measured by CIEDE2000
www.geoinformatics.upol.cz

5. www.geoinformatics.upol.cz

6. COLOUR SCHEMES
• Uniform colour distances between classes
www.geoinformatics.upol.cz

7. COLOUR SCHEMES
• Non uniform colour distances between classes
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8. CONSTRUCTION OF COLOUR SCHEMES
• Intersection of two subspaces
• CIE94
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9. CONSTRUCTION OF COLOUR SCHEMES
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10. SOFTWARE TOOL
• http://ostrubl.shopino.cz/free/barvicky.php
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11. www.geoinformatics.upol.cz