# Michelson contrast

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Cognitive Psychology: Attention · Learning · Memory · Motivation · Perception · Thinking

The Michelson contrast[1] is commonly used for patterns where both bright and dark features are equivalent and take up similar fractions of the area. The Michelson contrast is defined as

$\frac{I_\mathrm{max}-I_\mathrm{min}}{I_\mathrm{max}+I_\mathrm{min}},$

with $I_\mathrm{max}$ and $I_\mathrm{min}$ representing the highest and lowest luminance. The denominator represents twice the average of the luminance.

## References Edit

1. Michelson, A. (1927). Studies in Optics. U. of Chicago Press.

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