Let's say I have a brightest to darkest computer green colors, which is 255 possible combinations of green color, and if I pick the exact color of green, it would be stored in 1 byte. 1 byte = 8 bits. And 1 byte has 256 combinations. 256 - 255 = 1. Where does that 1 go?
It is 256 possible combinations of green color (from 0 to 255, that's 256 possibilities).