(countable) A difference in lightness, brightness and/or hue between two colours that makes them more or less distinguishable.
(uncountable) The degree of this difference.
The red and the orange don't have much Contrast between them — I can hardly tell them apart.
(countable) A difference between two objects,
people or concepts.
Israel is a
country of many contrasts.
(countable) A
control on a television, etc, that adjusts the amount of Contrast in the images being displayed.