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Which of the following embodies the achromatic notion of intensity?

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Which of the following embodies the achromatic notion of intensity?

(a) Luminance

(b) Brightness

(c) Frequency

(d) Radiance

This question was addressed to me in an interview.

Enquiry is from Light and the Electromagnetic Spectrum in portion Digital Image Fundamentals of Digital Image Processing

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Right option is (b) Brightness

Explanation: Brightness embodies the achromatic notion of intensity and is a key factor in describing color sensation.

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