Chapter 5
Marks and Channels
5.1 The Big Picture
Marks are basic geometric elements that depict items or links, and channels control their appearance. The effectiveness of a channel for encoding data depends on its type: the channels that perceptually convey magnitude information are a good match for ordered data, and those that convey identity information with categorical data. Figure 5.1 summarizes the channel rankings.
Figure 5.1.
The effectiveness of channels that modify the appearance of marks depends on matching the expressiveness of channels with the attributes being encoded.
5.2 Why Marks and Channels?
Learning to reason about marks ...
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