The blurring of a photo's background, a technique known as shallow depth of field or selective focus, makes the main subject appear exceptionally sharp and stand out with a three-dimensional quality by creating strong visual separation and utilizing specific monocular depth cues. Shallow depth of field refers to the photographic state where only a narrow range of distance from the camera is in sharp focus, while objects closer or farther than this range appear progressively blurred. This effect is primarily achieved by using a large lens aperture (represented by a small f-number), a longer focal length, or positioning the subject relatively close to the camera. When the background is blurred, it loses fine detail and texture, becoming ....
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