Similar psychophysical experiments have been conducted in goldfish ( Neumeyer 1992), but not with the spectral resolution necessary to derive the types of color matching functions used to calibrate RGB displays for humans.
Color-matching psychophysical experiments in humans have determined how the ratio of red, green, and blue primaries, such as those found in an RGB display, corresponds to human color perception ( Westland et al. The perception of color is neurally encoded by the ratios of quantum catches across an animal’s different photoreceptor classes. 1998 Fleishman and Endler 2000 Westland et al. One of the long-standing limitations of such methodologies, however, has been that RGB displays are only designed to simulate realistic real-world colors as perceived by the human visual system ( D’Eath 1998 Fleishman et al. 2014 Tedore and Johnsen 2015), and for the manipulation of morphology and movement patterns that would be impossible in live animals ( Hebets and Uetz 2000 Peters and Evans 2003 Tedore and Johnsen 2013 Woo and Rieucau 2015). Key words: color vision, computer animation, perception, video playback, virtual reality.Ĭomputer animation and video manipulation are powerful tools in the study of animal behavior, allowing for precise control of potentially correlated traits and behavior ( Veen et al.
MATLAB PLOT COLORS GIVEN RGB HOW TO
In this article, we outline how to use such equipment and information to generate video stimuli that mimic, as closely as possible, an animal’s color perceptual experience of real-world objects. What is required to determine optimal color rendering for another animal is a device capable of measuring absolute or relative quanta of light across the portion of the spectrum visible to the animal (i.e., a spectrometer), and data on the spectral sensitivities of the animal’s photoreceptor classes. How independently each RGB phosphor stimulates each of an animal’s photoreceptor classes determines the range of colors that can be simulated for that animal. However, it is sometimes possible to generate videos that accurately mimic natural stimuli in the eyes of another animal, even if that animal’s sensitivity extends into the ultraviolet portion of the spectrum. This is due, in part, to the fact that many animals have different numbers of photoreceptor classes than humans do and that their photoreceptor classes have peak sensitivities centered over different parts of the ultraviolet and visible spectrum.
The perceptual experience of an animal looking at an RGB display of imagery designed for humans is likely to poorly represent an animal’s experience of the same stimulus in the real world. The relationship between the ratio of red, green, and blue light and the perceptual experience of that light has been well defined by psychophysical experiments in humans, but is unknown in animals. RGB displays effectively simulate millions of colors in the eyes of humans by modulating the relative amount of light emitted by 3 differently colored juxtaposed lights (red, green, and blue).
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