The Helmholtz-Kohlrausch effect refers to the phenomenon where equally bright colors of different wavelengths appear to have different levels of brightness. In this case, the effect suggests that red-colored objects and lights appear brighter than green ones, which seems to contradict the commonly held belief that the human eye is more sensitive to green wavelengths.
The perception of brightness is a complex process influenced by various factors, including the sensitivity of our eyes to different wavelengths of light and the way our visual system processes and interprets the information it receives. While it is true that the human eye is most sensitive to green light, the perceived brightness of a color is not solely determined by its wavelength.
The Helmholtz-Kohlrausch effect can be attributed to a combination of factors, including the distribution of cones (color-sensitive cells) in the retina and the specific response of these cones to different wavelengths. Although the eye is more sensitive to green light, it does not mean that green objects will always appear brighter. Other factors such as the contrast between the object and its background, the overall luminance level, and the surrounding color context can also influence our perception of brightness.
Furthermore, the perception of brightness is not solely determined by the sensitivity of our eyes but is also influenced by higher-level cognitive processes. Our brain takes into account the context and expectations associated with a particular color, which can modulate our perception of brightness.
It is important to note that individual experiences and subjective interpretations can also contribute to conflicting opinions about the perceived brightness of different colors. Different individuals may have varying sensitivities, preferences, and interpretations when it comes to color perception.
In summary, while the human eye is more sensitive to green wavelengths, the perception of brightness is a complex process influenced by various factors, including the distribution of cones in the retina, the response of these cones to different wavelengths, and higher-level cognitive processes. The Helmholtz-Kohlrausch effect demonstrates that equally bright colors of different wavelengths can be perceived as having different levels of brightness due to these complex interactions.