professional counterfeiting teach you identify fake photo 3F rule

Each identification photo must use a variety of tools to teach you the recipe practical Comin, experts from fake photo identification company fourandsix Kevin Connor has shared his Bianjia experience, he said, but, overall, from the following few clues departure, he called 3F rule:
1 file (File)
Observe the photo file format and file information, photos to make a basic judgment.
a file storage format, photo storage format is psd, Photography Equipmentthis means that the number of the photo may after photoshop processing, not directly from the camera (of course, with the other software can store psd format).
b, file information, look at photos, create and modify information, Camera Equipment

there can be discerned.
c file packaged compressed, JPG this compression format, different software and hardware processing, there are subtle changes, with the appropriate tools to detect compression parameters will be able to know the photo once to sLighting Studioave time processing what software and hardware , the contrast and the parameters of the original of this document generated, it can be seen that the photo has been modified.
But above all the checks on the photo surface, and this step if the identified photoscamera tripod parameter changes, does not mean that the photo is a fake photo, photo adjustments rather than modifying.
The file may only open and then turn off may change the original photo. These two pictures are thumbnails (magnified 2 times), left of the photo thumbnails directly Camera Batteriesto photograph the Canon PowerShot S500, the right is opened in photoshop then do not do to change the photo thumbnails Save As. Right Flash Triggerafter sharpening and contrast adjustments automatically. Image source: fourandsix
Modify traces (Footprint)
As the detective footprints left at the scene from criminals can be inferred that the physical characteristics of criminals, and all leaves traces will modify photos. Photoshop magic, its photo modifications is a mathematical caCamera Flash Bracketslculation. Digital photo by a bunch of pixels by an algorithm combined PS modify merge or modify these algorithms is very easy to leave traces of the calculation. For example, just a simple copy and paste, it may form a high-contrast colors, because the background color of the source part of the photo will be copied to the bacCamera Flashkground color harmony; cloned pixel pattern appear in different places in a photo duplicate; shadows and light contrast adjustment sometimes at the edge of the screen bright and dark halo ... user ability to control the level of these traces may be very mild or very obvious.
In fact, you use these tools more familiar with, the more they are used can be inferred traces.