All 3 Uses

contrast
in
Persuasion, by Jane Austen
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Though neither Henrietta, nor Louisa, nor Charles Hayter, nor Captain Wentworth were there, the room presented as strong a contrast as could be wished to the last state she had seen it in.
Chpt 14 *

contrast = notable difference
The varieties in the fitting-up of the rooms, where the common necessaries provided by the owner, in the common indifferent plight, were contrasted with some few articles of a rare species of wood, excellently worked up, and with something curious and valuable from all the distant countries Captain Harville had visited, were more than amusing to Anne; connected as it all was with his profession, the fruit of its labours, the effect of its influence on his habits, the picture of repose and domestic happiness it presented, made it to her a something more, or less, than gratification.†
Chpt 11
His attentive deference to her father, contrasted with his former language, was odious; and when she thought of his cruel conduct towards Mrs Smith, she could hardly bear the sight of his present smiles and mildness, or the sound of his artificial good sentiments.†
Chpt 22

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
(4) (meaning too rare to warrant focus)