Why Does Rgb Go to 255

Can RGB values exceed 255?

You can only represent 256 possibilities with 8 bit since it is 2^8=2*2*2*2*2*2*2*2=256 . So no. For 24 -bit colors. 255 is thus simply defined as the maximum intensity of red/green/blue a monitor renders.

Why is it 0 to 255?

Because a byte, by its standard definition, is 8 bits which can represent 256 values (0 through 255).