In cities, it is often impossible to keep enough distance from tall buildings if you want to shoot completely, so it is inevitable to use a wide-angle lens. In addition, if you can't shoot from a high enough position, you will probably have to shoot from the ground-this will lead to serious perspective distortion. In the last picture, the vertical line of the tall building looks inclined inward. In Photoshop and other image processing software, tools are provided to correct barrel distortion and similar perspective problems, but the most effective solution is to prepare for post-processing in the process of pre-shooting. When shooting, pull the camera to yourself and leave a certain space outside the desired picture range. This is because a considerable part of the surrounding pictures will be cut off when correcting the distortion and cutting the pictures accordingly in the later stage. 1, display the grid and select [Filter] > in the Photoshop toolbar; Distortion > lens correction. In the interface that opens, check "Show Grid" at the bottom to make the screen display vertical and horizontal grids for reference. 2. Correct the vertical perspective in the original drawing. The problem of vertical perspective makes the building in the drawing look inclined to the center instead of perpendicular to the ground. Move the vertical perspective slider to the left to correct this distortion. 3. Correcting barrel distortion The barrel distortion in the original picture is also obvious. You can solve this problem by moving the Remove Distortion slider to the right. The Angle adjustment option can also easily straighten the horizon.