Replication of Results - Spatial Mathematics: Theory and Practice through Mapping - page 87

Figure 4.1 Color wheel. 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.
ever to understand how color can be used to communicate, particularly with
a rich medium such as maps. On the desktop computer, users of various soft-
ware packages in common use are exposed to the hue-saturation-luminosity
set of primitive terms on a regular basis. In addition, they see the RGB (Red-
Green-Blue) description using three primitive terms and the environment
of their printer and photocopier's toner and layers based on CMYK (Cyan-
Magenta-Yellow-Black). A color wheel can help the user to design strategies
for color change: To decrease magenta, for example, subtract magenta, or add
cyan and yellow (opposite from magenta) (Figure 4.1).
4.3 Color straws and color voxels
One obvious way to look at color, given two sets of primitives each with
three elements, is as an ordered triple in Euclidean three-space (Arlinghaus
and Arlinghaus, 1999). Indeed, that is how color maps are set up in older or
contemporary software such as Netscape, Microsoft Office, Adobe PhotoShop,
and so forth. Hue is measured across a horizontal x -axis ( Figure 4.2 ) and
saturation is measured along a vertical y -axis ( Figure 4.3 ) . The result is a
square or rectangle with vertical strips of color corresponding in order to the