Hexidecimal & RGB Colors

Minimum  = 0
Maximum = 255
RGB  

White
Black

0 0 0
255 255 255

#00000
#FFFFFF

Image below will illustrate. Each 2 digit represent a color since FF = 255 (the magic number). 

Refer to the Binary Hexadecimal Conversions guide if you don't know how to calculate hexadecimals and decimals.