The range that specifies the gray or grayscale levels is
(a) The value range from -1 to 1
(b) The value range from 0 to -1
(c) The value range from 0 to 1
(d) Any one of the above
This question was posed to me in a job interview.
My enquiry is from Color and Grayscale Levels topic in portion Graphics Primitives of Computer Graphics