Question

For an image of unsigned bytes, how can it be contrast-reversed?​

Answer 1

Answer:

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.