[suchow]

Yours is a definition of contrast, but not the one used in design or vision science [1, 2], where contrast is defined as a difference in luminance or color between regions of an image that makes objects and textures visible. If an image has no contrast, it is a solid patch. If an image has low contrast, the brightest or most colorful regions are not too different from the other regions, as if seen through a dense fog. If an image has high contrast, the brightest or most colorful regions are quite different from the other regions.

1. https://en.wikipedia.org/wiki/Contrast_(vision)

2. https://www.smashingmagazine.com/2014/09/design-principles-c...