What is the photographer's representation of the subjective meaning of the original scene?

Standard answer: changing the relationship between the brightness of the original scene and the density of the negative film is the reproduction of the photographer's subjective intention of the original scene.

First, explain the concept of "density" mentioned above.

Density: the degree of blackening of photosensitive materials after exposure and washing. Can also be simply understood as: density is black. We are usually called "thin" or "thick". Overexposed films have a high density (thick), while underexposed films have a low density (thin).

Second, about correct exposure.

1. Normal exposure: It means that the image normally reflects the brightness relationship of the original scene, which is the objective and real existence of the original scene. At this time, the exposure combination is mostly based on the brightness of the object with 18% reflectivity. (that is, the average reflectivity of the scene)

2. Exposure control: aiming at the photographer's creative intention, the relationship between the brightness of the original scene and the density of the negative film is changed, which is the reproduction of the photographer's subjective intention to the original scene. This method is often adopted by experienced photographers who have already created art.