How to create HDR image with a single picture?

Man

New member
I have a question about taking HDR (high dynamic range) pictures. I thought first you would need to take multiple pictures of the same frame (set up a tripod) using different exposures, then combine them together using software like Photomatix or Photoshop... But I also saw some pictures online that people did HDR using only 1 single picture - For example, picture of a moving subject - There is no way that picture was created using different exposures, since the subject is moving and the second picture u take would already be a different frame... How do they do that?
 
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