All 4 Uses of

contrast
in
Sense and Sensibility

His pleasure in music, though it amounted not to that ecstatic delight which alone could sympathize with her own, was estimable when contrasted against the horrible insensibility of the others; and she was reasonable enough to allow that a man of five and thirty might well have outlived all acuteness of feeling and every exquisite power of enjoyment.†
Chpt 7 *

contrasted = pointed to differences between; or compared to show differences

In books too, as well as in music, she courted the misery which a contrast between the past and present was certain of giving.†
Chpt 16 *

contrast = notable difference

She began almost to feel a dislike of Edward; and it ended, as every feeling must end with her, by carrying back her thoughts to Willoughby, whose manners formed a contrast sufficiently striking to those of his brother elect.†
Chpt 16

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