All 4 Uses

contrast
in
Rebecca, by Daphne du Maurier
(Edited)

A curious, perhaps too sudden contrast… As he spoke the car became one of many once again, dusk had fallen without my noticing it, and we were in the midst of light and sound in the streets of Monte Carlo.
Chpt 4

contrast = difference
I thought of all those heroines of fiction who looked pretty when they cried, and what a contrast I must make with blotched and swollen face, and red rims to my eyes.
Chpt 5 *

contrast = an unmissable difference when compared side-x-side
The contrast is too sudden; it almost hurts.
Chpt 10

contrast = difference
And when the last rocket burst and the cheering died away, the night that had been fine before seemed dull and heavy in contrast, the sky became a pall.
Chpt 17 *

in contrast = in a comparison that shows differences

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)