Why is the basic feature of photography the combination of light and shadow?

Excellent photographic works must be the perfect unity of documentary and artistry. The creation of photographic artistic image requires photographers to master the artistic skills and language of photography and skillfully use three main modeling methods: picture composition, light and tone (or tone). Pay special attention to the combination of light and shadow. Composition is framing, and the picture of a photographic work generally includes the subject, the accompanying body and the background. Composition is to organize them organically and form an artistic whole. There are many kinds of photographic composition, such as horizontal composition, vertical composition, diagonal composition, cross composition and so on. Photographic lighting, referred to as lighting, refers to the use of various light sources to illuminate the subject in the shooting process to achieve the ideal modeling effect. Photographic lights include headlights, side lights, back lights, neck lights, foot lights and so on. When shooting flexibly, it can strengthen the sense of space and three-dimensional sense of the picture, create an atmosphere, set off the theme, and make the work have touching charm. Tone and tone are also important modeling means of photography. Tone refers to the level of light and shade in black and white photos, and tone refers to the contrast and harmony of colors in color photos. Through artistic treatment, timbre and tone can produce artistic effects such as tone gradation, tone contrast, tone change and color change, color contrast and color harmony. , so that photographic works have strong emotional color and rich expressive force. In addition, the artistry of photography is reflected in the photographer's subjective feelings. Photographic works should reflect the artistic creativity of artists' thoughts and feelings through light, color and shadow. Therefore, photographers must be full of feelings and creative passion for the people and scenery they shoot. Only in this way can their works have touching artistic charm.