A Contrast

1. (countable) A difference in lightness, brightness and/or hue between two colours that makes them more or less distinguishable.
   1. (uncountable) The degree of this difference.
   2. (countable) A control on a television, etc, that adjusts the amount of contrast in the images being displayed.
2. (countable) A difference between two objects, people or concepts.
3. (countable, uncountable, rhetoric)Antithesis.