The role of putting light-absorbing black cloth when shooting in the shed

Actually, your understanding is quite correct. The function of putting black cloth is because it "absorbs light". We usually see the color of an object because it reflects the color in the light, so the color of the object we are talking about is actually the color of the color it reflects. A black object absorbs all the colors that the light source shines on it and becomes black; In order to control the illumination on both sides of the subject in the studio, black cloth should be hung on both sides to prevent stray light or redundant reflected light from being reflected into the lens and recorded in the image.

The best light-absorbing cloth is black velvet, which has the strongest light-absorbing ability, and of course the price is a little higher.