Two colors that do not have as great of an Helmholtz–Kohlrausch effect as the others are green and yellow. Certain colors do not have significant effect, however any hue of colored lights still seem brighter than white light that has the same luminance. An exception to this is when the human observer is red-green colorblind, they cannot distinguish the differences between the lightness of the colors. This makes us believe that the colors are actually brighter. When the colors are more saturated, our eyes interpret it as the color's luminance and chroma. The way humans perceive the brightness of the lights is different for everyone. Lightness Įven when they have the same luminance, colored lights seem brighter to human observers than white light does. However, when the top image is converted to grayscale, we have the image on the bottom-a single shade of gray. The yellow (second from the left) appears to be much darker than the magenta (right-most). Each color on top has approximately the same luminance level and yet they do not appear equally bright or dark.
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