What do you mean by sharpening apples?

It is the iPhone's camera that is over-sharpened when taking pictures. The photos taken by the camera are really not so good, the saturation is reduced, the overall sharpening is too serious, and the photographer is better.

Image sharpening is to compensate the contour of the image, enhance the edge and gray jump of the image, and make the image clear, which can be divided into spatial domain processing and frequency domain processing. The purpose of image sharpening is to highlight the edges and contours of objects or the characteristics of some linear target elements in the image. This filtering method improves the contrast between the edge of the ground object and the surrounding pixels, so it is also called edge enhancement.

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The essence of sharpening operation is to increase the contrast of image details, which is helpful for our eyes to see the image details clearly, so that the image appears angular and clear, which is a necessary condition for all good quality photographic works. The image directly copied by the scanner will look monotonous and fuzzy if it is not cropped, so we often need to sharpen the processed image.