Photographic pictures are divided into bright tone, dark tone and intermediate tone due to the different brightness and contrast of tone. The overall effect is dark tone.

regardless of hue, all kinds of gradation composed of solid colors with different amounts of black are collectively referred to as dark tones, for short ... so dark tones are an extreme color and an ideal tone. Dark tone can also be defined as a dark sequence of various colors, or it can be defined as composed of clear colors in dark colors. This is due to the different definitions of bright color, dark color, clear color and turbid color.