Comment by freetime2

My first thought reading this headline was "Really? Nobody thought of this until now?" But reading further, the Dstretch plugin has been around since 2005 or so. And presumably people have been using contrast enhancement, color manipulation, multispectral imaging, etc. to uncover hidden images long before that.

So not exactly "news" at this point. But still a pretty cool success story.

It almost feels like a feature that should be built into the default camera app. For anyone wanting to conduct their own forensic analysis to determine how thoroughly their hotel room has been cleaned, for example (although personally I'd probably rather not know).