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
She increased the video’s contrast by making dark pixels darker and light pixels lighter.
Some technical definitions of contrast consider intensity of color. Other definitions consider only black and white.
We increased the photo’s contrast, so we can better see minor detail.
As beams of light tinted the clouds with blazing colors, everything gained a sharp contrast: brightly lit on one side, deeply shadowed on the other.
Christopher Paolini -- Eragon
The picture was beautiful, however, the composition perfect. ... In the last few months, though, it had started to look kind of eerie to me. Like I couldn’t just see the fine white-on-black contrast, or the way our features repeated themselves, in different measure but always similar, across our faces. Instead, when I studied it, I saw other things.