What is the sharpness of the camera?

The sharpness of camera refers to the "sharpness" of camera shooting, which is an index reflecting the sharpness of image plane and edge.

If the definition is increased, the detail contrast on the image plane is also higher and looks clearer. For example, in the case of high definition, not only the wrinkles and spots on the face on the screen are clearer, but also the protrusions or depressions of facial muscles can be lifelike.

On the other hand, dark lines or black lines in the vertical direction, or places where black-and-white images suddenly change, in the case of high sharpness, the edges of lines or black-and-white images suddenly change more sharply, and the overall picture appears clearer. Therefore, improving sharpness is actually improving clarity, which is the good side that people need.

Extended data:

Photography field

I. Definition

In the field of photography, sharpness is used to represent the contrast of image edges. A clearer definition is that sharpness is the derivative amplitude of brightness with respect to space. Due to the characteristics of human visual system, high-definition images look clearer, but in fact, the increase in sharpness does not improve the real resolution.

Second, the impact

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, excessive sharpness makes the small scars and pimples of human skin magnified and prominent (that is, more obvious than what the actual naked eye looks like), resulting in rough and dry face. Therefore, in portrait photography, we should choose a lens with moderate sharpness instead of blindly pursuing high sharpness.

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