How to shoot a virtual picture of the back scene with a mobile phone?

Background blur effect is a common technique in photography, which can simplify the background and highlight the subject, and is especially widely used in portrait photography.

1, the subject matter of photography should not be too big. Background blur effect is usually used to shoot flowers, insects, portraits and other still lives. Few people will use the effect of "blurring the background" to photograph tall buildings, rivers and mountains. 2. The shooting distance between the mobile phone and the photographer is closer; The shooting distance between the subject and the background is far. The principle of background blur is to make the subject and background of photography in two focal planes. One is clear, and the other is necessarily vague. 3, the phone set "big aperture". The function of large aperture was once the patent of camera. Nowadays, large aperture has become the "basic function" of many smart phones. The purpose of opening the aperture is to reduce the depth of field. The range of depth of field can also be understood as the "definition range" of photos. The smaller the depth of field, the smaller the "clear" area of the photo. 4. Take photos with the photo App software. Another advantage of taking photos with smart phones is that many photography applications can be installed on smart phones. Photography Xiaobai can directly open the App to take pictures, retouch pictures and take pictures at once. If you want any effect, you can apply the filter directly when taking pictures.