Both Uses

contrast
in
City of Ashes
(Edited)

She wore a neat black suit, very plain, in contrast to the multiple brightly colored rings that burned on her fingers.
Chpt 3 *

in contrast = in a comparison that shows differences
Even his hair seemed darker, in stark contrast to the white of his skin.
Chpt 12 *

contrast = difference (in brightness or tone)

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)