The document discusses Erik Duval's presentation on Edward Tufte's principles of data ink design. It outlines Tufte's key principles: showing the data above all else, maximizing the data-ink ratio by removing non-data ink, erasing redundant data ink, and revising and editing visualizations. The data-ink ratio refers to the proportion of ink devoted to displaying non-redundant data information. The principles aim to clearly display the maximum amount of data with the minimum amount of graphical elements.

1. Information visualisation
Data ink design principles
20 April 2015
Erik Duval
Dept. Computerwetenschappen, KULeuven
http://erikduval.wordpress.com & @ErikDuval
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2. Tufte’s principles
• Above all else show the data
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3. • Data ink:“non-erasable core of a graphic...”
(Tufte, 1983)
• Data-ink ratio
= data-ink / total ink
= Proportion of a graphic’s ink devoted to
the non-redundant display of data-
information.
= 1.0 – proportion of graphic that can be
erased without the loss of information
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4. Tufte’s principles
• Maximise the data-ink ratio, within reason
• Erase non-data ink, within reason
• Erase redundant data-ink
• Revise and edit
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30. “Perfection is achieved not
when there is nothing more
to add, but when there is
nothing left to take away”
Antoine de Saint-Exupery
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31. ?
@ErikDuval
h.p://erikduval.wordpress.com
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