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Color scales. Image-maker's duty is to faithfully map colors onto a data set. Perceptual palette B utilizes color and its properties to represents terrain elevation much better than palette A. Image by Matteo Niccoli, Mycarta, 2013 (Modified.))  

Color scales. Image-maker's duty is to faithfully map colors onto a data set. Perceptual palette B utilizes color and its properties to represents terrain elevation much better than palette A. Image by Matteo Niccoli, Mycarta, 2013 (Modified.))  

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This article discusses terminology useful toward the creation and discussion of visualizations. It continues and expands on a hands-on tutorial delivered by the author at the VisWeek2012 conference in October 2012 in Seattle, WA. Today, many fields of scientific activity have become increasingly reliant on visuals as means of dissemination, explora...

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Context 1
... twenty variables are to be colored in one chart, a skilled image-maker should consider ways of restructuring the data (sub-categorization, using several charts, etc.) Secondly, 2) colors used to measure should be used intelligently and with respect for the whole scale they represent. It is common practice to use full-spectrum rainbow color scales to quantify data in maps and diagrams, even though the full spectrum scale does not offer a visually uniform distribution of hues ( figure 4A). Extreme ends of the rainbow scale tend to exaggerate value fluctuations and visually dominate an image, whereas the middle section of the spectrum lacks sufficient definition and contrast to give true justice to the whole range of values in that part of the rainbow figure 4B). ...
Context 2
... is common practice to use full-spectrum rainbow color scales to quantify data in maps and diagrams, even though the full spectrum scale does not offer a visually uniform distribution of hues ( figure 4A). Extreme ends of the rainbow scale tend to exaggerate value fluctuations and visually dominate an image, whereas the middle section of the spectrum lacks sufficient definition and contrast to give true justice to the whole range of values in that part of the rainbow figure 4B). Thirdly, 3) when choosing colors one should always be cognizant of those who possess color deficiencies. ...
Context 3
... informed image-maker strives to design for the widest possible audience -in the end it is in everyone's best interest. Color scale presented in figure 4B is an example of this highly appraisable design policy of inclusivity. ...

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... Within the data visualization, no more than six to eight distinct colors should be used to encode data items close to each other. The human visual system cannot distinguish more than eight (Kultys, 2013). Colors that are used to measure should be used with intelligence and a colors saturation level should be scaled to the scale of measurement that color is representing. ...
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