There are a lot of ways to do this! AI still isn’t perfect, and careful scrutiny will often reveal that the subtle details of an image don’t quite make sense, like shadows going in the wrong direction or patterns repeating in a strange way, or objects that are the right shape, but don’t actually seem to be functional. When analyzing a photograph, there are numerous techniques to determine if it has been altered in some way. For instance, if you composite two images together to, say, put someone’s head on another person’s body, you might be able to tell that the light casting shadows on the head isn’t coming from the same direction as the rest of the body, or that the person’s face is not actually at the same focus depth as other things in the image that seem to be at the same spot (imagine a photograph shot down a long street such that the cars far away are in focus, and then also, strangely, a person walking close to the camera is also in focus).
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