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Figure 4.2 Animated color map (linked to QR code):
http://www-personal.umich.
one moves across the x-axis. Derived from Netscape 7.2. Source: Arlinghaus, S. L. and
W. C. Arlinghaus. 1999. Animaps III: Color Straws, Color Voxels, and Color Ramps.
Solstice: An Electronic Journal of Geography and Mathematics. Volume X. No. 1. Ann
Arbor: Institute of Mathematical Geography. Source of base image: Netscape software.
http://www-personal.umich.edu/%7Ecopyrght/image/solstice/sum99/animaps3.html.
pattern on the color wheel. A third axis of luminosity (a gray scale) is often
seen as a strip to the right of this square (
Figure 4.4
). It serves to match the
selected color against light/dark values.
These animated color maps fix two dimensions and allow a third one to
vary. That variation shows up in the small rectangle to the lower left of the
color map and also in the “straw” to the right of the plane region. In all
three cases, hue is the variable mapped on the horizontal axis, saturation
is the variable mapped on the vertical axis, and luminosity is the variable
mapped in the straw to the right. Once again, axes are important. Thus, in
Figure 4.2, luminosity is fixed at 120 as indicated by the small arrow to
the right of the straw. Saturation is fixed at 180 along the left side of the
rectangle. Only hue is allowed to vary, as shown in the progression of the
crosshair movement. The small rectangle to the lower left of the color map
changes in color to show the hue of the current position of the crosshair.
Thus, to see a hue-straw, one would need to take all 256 colors available in
the flashing rectangle and stack them up in order of progression. Similarly,
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