high key

noun, Movies.
1.
a style of lighting that is bright, even, and produces little contrast between light and dark areas of the scene.
Origin
1915-20

high-key

[hahy-kee] /ˈhaɪˈki/
adjective
1.
(of a photograph) having chiefly light tones, usually with little tonal contrast (distinguished from low-key).
Origin
1915-20
British Dictionary definitions for high-key

high-key

adjective
1.
(of a photograph, painting, etc) having a predominance of light grey tones or light colours Compare low-key (sense 3)