Who knows how to take pictures with a flashlight?

What you are talking about is a post-synthesis method with black as the deductive foreground and photos as the background. The photo was taken in the light and the video was taken in the dark. Shoot the trajectory of flashlight light with a camera, and finally edit it with non-editing software. It is the reverse use of alpha channel in video editing, which requires certain post-editing ability of film and television. In Adobe Premiere, you can use the transparent setting of the video track to achieve the scene you need, that is, you can see the place and background illuminated by the flashlight in the photo. If in doubt, please add QQ45604 17 for details.