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What is subjective brightness?

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in Digital Image Processing by (701k points)
What is subjective brightness?

(a) Related to intensity

(b) Related to brightness

(c) Related to image perception

(d) Related to image formation

I had been asked this question by my school principal while I was bunking the class.

Asked question is from Elements of Visual Perception in chapter Image Restoration and Reconstruction of Digital Image Processing

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Best answer
The correct option is (a) Related to intensity

Best explanation: It is the intensity as perceived by the human eye.

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