How to easily and well cut out still images from videos taken with iPhone
If you want to take pictures as beautifully as possible, but you don't know when a photo opportunity will appear, or if you tend to blur because you are shooting a pet that is not still, the best way is to shoot a video and capture the best moment. The iPhone camera also has a continuous shooting (burst) function, but movie shooting is more suitable for subjects that are likely to take 5 or 10 minutes to reach a photo opportunity.
The image quality is of concern, but iPhone 6s / 6s Plus and later models support video recording at 4K (3,840 x 2,160) resolution, so if you export one scene as a still image, it will be a photo of about 8.3 million pixels. Will be. Some video editing apps have a still image cropping function, so it's best to use it.
However, some may argue that you don't want to use valuable storage space for video editing apps that you use only occasionally, and that you don't have to use 4K resolution or lower anyway to reduce the size. In such a case, it is possible to use the screenshot function of iOS (the function to export the screen as a still image).
The procedure is simple. Start playing the video in the "Photos" app and hold the iPhone horizontally (the video is displayed almost in full screen). Next, tap the "||" button at the top right of the screen to pause at an appropriate timing, then drag the time bar at the bottom of the screen to the left or right to stop at this scene. If you tap the appropriate position on the video, the time bar and the toolbar at the top of the screen will disappear and the screen will be displayed in full screen, so you can take a screenshot there (for iPhone X, press and hold the volume button and sleep button).
The resolution of the still image cut out by this method differs depending on the iPhone used. In the case of iPhone X, the screen resolution is 2,436x1,125 pixels, so videos shot at 4K resolution will also be displayed according to the vertical display limit value (1,125 pixels) of iPhone X, so it will be 2,000 x 1,125 pixels. (Margins of 218 pixels on each side).
