What does HDR mean by taking pictures with an Apple phone?

HDR stands for high dynamic range imaging.

High dynamic range imaging was originally used only for images generated purely by computers. Later, people developed some methods to generate high dynamic range images from photos with different exposure ranges, digital cameras became more and more popular, and desktop software became easy to use.

Many amateur photographers use high dynamic range imaging to generate photos of high dynamic range scenes, but don't take this as the only purpose. In fact, there are many other applications in the high dynamic range.

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Tips for using HDR:

1, flash photography: HDR and flash cannot be turned on at the same time. When using an external light source to illuminate a dark object, you must also keep your hands steady or use a tripod.

2. Landscape photos: A classic application of HDR function is landscape photos under blue sky and white clouds. Turning on HDR can make the sky bluer and the grass greener, but the only exceptions are sunrise and sunset.

3. Outdoor portrait: When shooting outdoor backlit portraits, first select the focus on the face of the person, and then shoot with HDR function, so that both the person and the background can have appropriate exposure.

References:

Baidu Encyclopedia-HDR (Application and Development of HDR in Cameras)