The origin of air sensation

In fact, there is no clear boundary between spatial sense, spatial sense and three-dimensional sense. The sense of space is the present image reflected by the subtle changes caused by different air boundaries. The three-dimensional sense mainly lies in that when we "look" at the subject, we have a feeling of protruding non-plane, not only the relationship with the background (one of the main factors), but also the protruding feeling of the subject itself. The basic elements of stereoscopic impression include the difference of color levels. As for the subtle differences between reality and reality, there are many different levels between reality and reality. It is necessary not only to have levels, but also to coordinate with each other to produce an excellent three-dimensional sense.

Spatial sense refers to a larger range than the above two, even including the above two, which can be divided into combined spatial sense and optical spatial sense. As far as the combined sense of space is concerned, it includes perspective line, texture density and occlusion relationship ... As far as the optical sense of space is concerned, it is actually similar to the part referred to by the air sense. However, in photography, because of the control variable of whether to focus, the subtle changes caused by it can be well explained. The sense of space means that people can produce the feeling of physical space through the combination of various factors. Practically speaking, it should also include binocular and motion clues, but general photography usually only involves monocular clues, and motion clues can be further divided into perceptual differences caused by the motion of subject and object in space, but this part can be ignored first, unless the shutter speed is slow to a certain extent or the motion speed is fast to a certain extent.