What are the characteristics of high-key, low-key and middle-key?

High-key, low-key and intermediate tone are distinguished by the depth of the main tone, the degree of light and shade, the tone effect, the artistic conception and atmosphere of the work. High-profile pictures are mostly white, light and other bright colors, and dark colors are rarely used to hook the body and make the finishing touch. Themes and images are mostly pure, noble, sunny, quiet and enterprising. Low-key photos are dominated by shadows such as black and dark. Rarely use light color and highlights to hook characters and carve images, and the themes and images are mostly dignified, deep, profound and powerful. Mid-tone photos are between high-profile photos and low-profile photos, with gray as the main tone. Moreover, photos with rich colors have a wide range of contents and themes, and most of the themes and pictures are mild and cheerful, which is suitable for depicting the details of the picture. What color tone the photographer chooses to take pictures depends on the theme of the work and the environmental conditions of the shooting scene.