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Weber contrast

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The Weber contrast is defined as in studies of contrast

 
\frac{I-I_\mathrm{b}}{I_\mathrm{b}},

with I and I_\mathrm{b} representing the luminance of the features and the background luminance, respectively. It is commonly used in cases where small features are present on a large uniform background, i.e. the average luminance is approximately equal to the background luminance.


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