Definition of "Contrast" :
noun: the act of distinguishing by comparing differences
noun: the range of optical density and tone on a photographic negative or print (or the extent to which adjacent areas on a television screen differ in brightness)
noun: the perceptual effect of the juxtaposition of very different colors
noun: a conceptual separation or distinction
noun: the opposition or dissimilarity of things that are compared
"In contrast to."
verb: put in opposition to show or emphasize differences
"The middle school teacher contrasted her best student's work with that of her weakest student."
verb: to show differences when compared; be different
"The students contrast considerably in their artistic abilities."