Question

The subtraction operation results in areas that appear as dark shades of gray. Why?

(a) Because the difference in such areas is little, that yields low value

(b) Because the difference in such areas is high, that yields low value

(c) Because the difference in such areas is high, that yields high value

(d) None of the mentioned

I have been asked this question in final exam.

I'm obligated to ask this question of Enhancement using Arithmetic Operations topic in chapter Image Enhancement of Digital Image Processing

Answer 1

Correct option is (a) Because the difference in such areas is little, that yields low value

The explanation is: There remains a little change in some areas in the images to be subtracted that yields low value and so the result appears as dark shades of gray.