前后两端分别配置有摄像头，背面的摄像头用于拍摄高清影片和照片，前端的色相头用于视频会话。
There are the front and rear cameras —the rear for shooting videos and photos, the front for FaceTime video conferencing.
比如下图中两个图层中的颜色都作了调整，使照片效果开起来风向是拍摄于城市而不是公园，改变图像颜色的效果，可以通过使用色相/饱和度工具调整色相来达到。
For example, in the image below, the color of the two layers were changed to make the background bokeh look like it came from a city instead of a park.
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