All 5 Uses of

contrast
in
Main Street, by Sinclair Lewis

But it is morally instructive to know that he was a good student and educated himself, in striking contrast to the loose ways and so-called aristocratic society-life of Lord Byron, on which I have just spoken.†
Chpt 11 *

contrast = notable difference

With Carol, Mrs. Howland, Mrs. McGanum, and Vida Sherwin she was a link between the Jolly Seventeen and the serious Thanatopsis (in contrast to Juanita Haydock, who unnecessarily boasted of being a "lowbrow" and publicly stated that she would "see herself in jail before she'd write any darned old club papers").†
Chpt 11

in contrast = in a comparison that shows differences

The scattered houses between which they passed in town were small and desolate in contrast to the expanse of huge snowy yards and wide street.†
Chpt 15 *

And when it comes down to this tailor, why, can't you see—you that take on so about psychology—can't you see that it's just by contrast with folks like Doc McGanum or Lym Cass that this fellow seems artistic?†
Chpt 33

Swinburne would be such a—well, that is, such a contrast to life as we all enjoy it in our beautiful Middle-west——" She saw that Mrs. Leonard Warren was not with her.†
Chpt 11

Definitions:

(1) (contrast as in: contrast their writing styles)
point to differences between; or compare to show differences
(2) (contrast as in: there is a contrast)
a difference -- especially a notable difference; or the side-x-side arrangement of things that draws attention to an unmissable difference
(3) (contrast as in: sharpen the picture contrast)
the difference between tones of an image -- as in a photo or video -- such as the quality of brightness or the intensity of shades or colors