Sharp photography field

In fact, in the field of photography, the high definition of the lens is a double-edged sword. On the one hand, it makes the visual effect of the picture clear. On the other hand, due to the improvement of contrast, some unpleasant big details are enlarged and small details are covered, which leads to the decline of actual details and lack of hierarchy. For example, in portrait photography, the excessive sharpness makes the small scars and pimples of human skin magnified (that is, more obvious than what the actual naked eye looks like).

In addition, it is expensive to artificially increase sharpness through software. After excessive sharpening, most observers will see the separated boundary and feel a halo of light and dark around the line segment.