What are the characteristics of color and light and shade in photography?

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.