contrast

the opposition or dissimilarity of things that are compared

“in contrast to”

a conceptual separation or distinction

to show differences when compared; be different

“the students contrast considerably in their artistic abilities”

put in opposition to show or emphasize differences

“The middle school teacher contrasted her best student's work with that of her weakest student”

the act of distinguishing by comparing differences

the perceptual effect of the juxtaposition of very different colors

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)