Question: 21. Define subjective brightness and brightness adaptation 22. Define weber ratio 23. What is meant by machband effect? Machband effect means the intensity of the

21. Define subjective brightness and brightness adaptation

22. Define weber ratio

23. What is meant by machband effect?
Machband effect means the intensity of the stripes is constant. Therefore it
preserves the brightness pattern near the boundaries, these bands are called as machband
effect.
24. What is simultaneous contrast?

25. What is meant by illumination and reflectance?

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