pigmented colorants: dependence on media and time - Cornell ...

Figure 3.15: These graphs show how the amount of light by photoreceptors
varies with the wavelength of the light. Adapted from [SB02].
lights. Let ˆr, ˆg, and ˆ b, be the spectral energy curves associated with the three
lights. These lights can be of any color (red, green, and blue, for example), as
long as they are perceived differently to the viewer and are not combinations of
each other. Hence, each light will excite the short S, medium M, and long L
wavelength-sensitive cones to differing degrees.
Figure 3.16: RGB color space. Q is the color vector, and its RGB components
of Q are in gray. The blue triangle illustrates the unit plane.
Given these lights, we can create new colored spectra by combining them in
varying intensities. Since emitted lights are an additive color system, the final
spectrum of the new color will be Rˆr + Gˆg + B ˆ b, where R, G, andB are scalars
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