Originally Posted by nosnoop 
What does that mean? What is an image fingerprints? Do you mean you can identify the camera model from the image alone without the exif? Haven't heard of it before.
The image software used for this comes from MIT. In a nutshell it detects a signature pixel array while searching and acquiring algorithm traces within the image. These pixel array patterns are unique to each specific Image sensor and the individual camera model and serial number.
In conclusion the EXIF data of a digital image can be removed but the signature pixel array can not. This specific data is retained within the pixel array of the image no matter how it may have been manipulated.
In other words a digital "fingerprint" that is unique to the specific digital image.
This detection software is not available to the general public. It is used for forensic analysis.
Hope I answered your question,
Kind of unsettling but very useful.
Wendy