Audio Cartography: Visual Encoding of Acoustic Parameters - Advances in Cartography and GIScience - page 21

5.4 Sound Energy
We apply the graphic variable saturation to present linear sound energy
(Morrison 1974). This is achieved by connecting the variable with color
hue to simultaneously present sound energy and the corresponding source
( Fig. 4 ) . Our visual encoding considers attenuation of emitted sound
energy due to absorption and varies the saturation of the color. Perceptual
variation in color hue and saturation is non-linear, but using the perceptual
CIELuv color model we are able to vary saturation in a perceptually-linear
manner (Wijffelaars et al. 2008).
Figure 4: Color hues are perceptually-linear varied in saturation