We just completed the final update to our Photo Tampering Gallery for 2012, so now seems like a good time to take a look at the past year and comment on any trends we’ve seen in the misuse of digital editing.
Welcome to the Fourandsix blog, where you’ll find tips on image forensics techniques and commentary on issues relevant to photo tampering and the responsible use of imaging tools.
A video purportedly showing an eagle swooping down and snatching a baby has gone viral. Given how unlikely the video seems, there is a vigorous debate about its authenticity. We performed a forensic lighting analysis on this video to determine if it is real or fake.
Over the past year and a half Kevin and I have been writing on a variety of issues related to image manipulation and authentication. Beyond the ethical, legal, and economic implications of image tampering, recent studies suggest that doctored images can have an impact on our memories of past events, and our perceptions of future events.
I recently stumbled upon a bizarre and seemingly improbable image showing a utility pole in the middle of Highway 251 east of Montreal Canada. I don’t mean a downed utility pole; I mean, an upright and functioning utility pole placed directly in the middle of a highway. At first glance, it seemed likely that this was a photo hoax, particularly since the pole’s shadow appears to either be missing or impossibly small.
In part 1 and part 2 of this series I described how differences in the location of the built-in camera flash can provide useful information in the forensic analysis of an image. Specifically, I described how we can determine if cast shadows are consistent with the location of the camera flash. Here I will describe another aspect of flashes that can be informative.