Color illusion 30
Since Gebruary 2, 2026
"White and black horses with the same gray"
The left horse appears white and the right horse appears black; however,
their luminance is identical (R124, G124, B124). In the left image, all
pixels have 80% blackness, while in the right image, all pixels have 20%
whiteness. Under these conditions, achromatic pixels exhibit a luminance
of 20%. This is the mechanism behind this lightness illusion.
Copyright Akiyoshi Kitaoka 2026 (February 2)
cf.
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