Hidden information inside digital photos can reveal much more than photographers and their subjects bargain for
According to the BBC:
When you take a photo, your smartphone or digital camera stores “metadata” within the image file. This automatically and parasitically burrows itself into every photo you take. It is data about data, providing identifying information such as when and where an image was captured, and what type of camera was used.
It is not impossible to expunge metadata, using freely available tools such as ExifTool. But many people don’t even realize the data is there, let alone how it might be used, so they don’t bother to do anything about it before they post images online. Some social media platforms remove information like