22-11-2010, 05:53 PM
David Guyatt Wrote:Jack White Wrote:Study showing pasted in earth photo.
Jack
Jack, is the technique you used, one that forensic professionals apply to photo's in order to validate they are genuine or not? In other words is it a recognized method to root out fakes.
With zero knowledge of photographic fakery and the techniques of analysis, I rather thought your picture was quite telling.
Yes...it is a well known technique to bring out subtleties in exposure
variances to a far greater tolerance than ordinary darkroom techniques.
Every image on a computer is made up of three colors...simply called
red-green-blue, or RGB. Even b/w images are made up of RGB pixels.
Selective manipulation of the RGB tonal values is virtually limitless in
combinations, and can be viewed on the screen in real time, so dozens
or hundreds of combinations can be viewed in just a few minutes. Thus
when something suspicious shows up, it can be examined in detail by
further refinement. I should emphasize that THE COMPUTER DOES ALL
THE WORK AUTOMATICALLY. The operator only handles what the computer
is looking for. This technique has been in use for at least 20 years to my
knowledge.
Jack

