A very depth article from OE Magazine on how to identify falsified image. The article covered several straight-forward techniques to find out whether an image is original or fake. It also give us a hint on what method people usually use to create fake image.

A fake image can be defined as an image of an object or scene that wasn’t captured as the image would imply. In general, fake images are created to generate a deception, but not all fake images are bad. The motivation may be simply for harmless entertainment, which accounts for most fake images generated today. Fake images can be generated for research and development purposes, e.g. to understand image quality issues with different camera designs. The fake images that concern us most are those that are created to perpetuate a lie. Some people will generate fake images for profit, such as a picture of an alien, a ghost, or an alien ghost of Elvis that they can then sell to a tabloid. Probably the most dangerous motive for generating fake images is to alter the public’s perception of truth for political reasons.

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