contrast

noun

the act of distinguishing by comparing differences
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)
the perceptual effect of the juxtaposition of very different colors
a conceptual separation or distinction

line
the opposition or dissimilarity of things that are compared
“in contrast to, by contrast”
direct contrast

verb

to put in opposition to show or emphasize differences
“The middle school teacher contrasted the best student's work with that of the weakest student.”
to show differences when compared
“The paintings contrast the painter's development over time.”
counterpoint