Question

3.
For an image of unsigned bytes, how can it be contrast-reversed?
A Subtract each pixel from 255
B Subtract each pixel from 127
C Negate each pixel
D Subtract 255 from each pixel​

Answer 1

Answer:

A Subtract each pixel from 255

Step-by-step explanation:

The way to find this is to look at the colour wheel and draw a line across it from green -- you will find that the colour "opposite" it across the wheel is magenta. For an image of unsigned bytes, how can it be contrast-reversed? 255 - 255 = 0 and 255 - 0 = 255, so subtracting from 255 does this.