Tried a couple images, and found that an image shot in RAW and converted will never pass their test. The one thing they cannot detect is a photo of a photo, so that really is the "open door" to gaming their system.
Their forensic tests seem to rely on both the structure of the file and the JPEG compression settings. It gave me a "high trust" rating for a native 6D Large/Fine JPEG, but rejected a 6D image shot in RAW, converted in Lr and exported from Lr. this is because they are looking at the JPEG compression characteristics, or "fingerprint" if you will for that camera model, and the JPEG did not come from the camera.
ETA:
Interestingly, I also earned a "high trust" result with an out-of-camera JPEG using the camera's Small/Low Quality JPEG setting, resulting in a 5Mpx file only 599KB in size. So their algorithms are sophisticated enough to know that a given camera might produce a range of outputs.
Message edited by author 2014-05-06 18:05:14. |
