What is it about?
The amount of light coming from an object does not always predict how bright it looks. We asked people to rank the brightness of hundreds of colored patches and found a simple rule that predicts these judgments surprisingly well. Perceived brightness depends strongly on the most intense of the red, green, and blue signals reaching the eye.
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Why is it important?
Current standards for measuring light are widely used in lighting, displays, cameras, and imaging. Our results show that these measurements can differ substantially from how bright colored objects actually look. A better description of perceived brightness could therefore improve how light and color are measured, reproduced, and compared in everyday technology.
Perspectives
What I find most striking about this work is how such a basic question could remain surprisingly open. We have had precise physical measures of light for well over a century, yet these measures were known to not always match how bright colored objects actually look. I hope our work encourages a renewed discussion of the relationship between how light is measured technically and how it is experienced visually.
Karl Gegenfurtner
Justus Liebig Universitat Giessen
Read the Original
This page is a summary of: Perceptual and neural constraints on photometric measures of heterochromatic brightness, Proceedings of the National Academy of Sciences, August 2026, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2610398123.
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