Sharpness in photography

2026-03-03 00:36

Sharpness in photography was a physical measurement used to measure the quality of the edge of a picture. It could also be called "definition." The quality of the edge was related to the definition perceived by the human eye. It was an indicator of the clarity of the image plane and the sharpness of the edge of the image. From the perspective of imaging, sharpness described the speed at which the image information at the border transitioned. The transition speed of high contrast was fast and could form a clear edge, while the transition buffer existed in low contrast, and the image edge was blurred. The sharpness could be judged by the clarity of the edges and details of the objects in the picture. The higher the sharpness, the clearer the details of the picture. On the contrary, the picture was blurry, the details were not expressed enough, and the edges were not coordinated with the picture. Sharpness was related to contrast. The higher the sharpness, the higher the edge contrast. Increasing the edge contrast would also increase the sharpness. The "sharpening" function in the image processing software used this principle. In photography, different scenes had different requirements for sharpness. When shooting a landscape, one often pursued sharpness to obtain a sense of déjà vu. However, when shooting a portrait, too high sharpness would cause particles to appear on the skin of the character, magnify small skin flaws, and even cause white edges to appear on the edges of the face, hairline, eyebrows, eye sockets, nose, lips, and other black and shadow parts, affecting the image effect. In addition, there were other factors that would affect the sharpness of the photo. In terms of lenses, the sharpness of a fixed-focus lens was generally higher than that of a zoom lens. Because of the large number of lenses in a zoom lens, it was more difficult to design, and it was easy to produce optical aberrations. Moreover, the large number of lenses would reduce the contrast and increase the facula. The fixed-focus lens usually had a larger aperture than the zoom lens. Under the same circumstances, the sharpness of a large-aperture lens was higher than that of a small-aperture lens. In terms of shooting operations, use a high-speed shutter when shooting with a hand-held camera, stabilize the camera to reduce shaking, use a low sensitivity to reduce noise, and focus correctly to make the subject clear.(Automatic focus is convenient and practical, and manual focus can achieve better control when shooting speed is not required), adjusting the photo style to increase the sharpness (can be directly set in the camera photo style), using a wide-angle lens to shoot scenery (large depth of field, large front and back clear range), long-distance shooting (the clear range of the focus can cover the background to make the picture clearer), etc. all help to improve the sharpness of the photo. "The Female Police Officer and the Criminal Organization" is equally exciting. Everyone is welcome to click and read it!