Could you bet on a photo being "photoshopped"? Stefano Virgilli can show you how to spot the trick. Using some of the not-so-famous features of Adobe Photoshop, everyone can now be a detective. Stefano will also share a real police case happened in Italy, where a photoshopped picture was used as evidence to solve a crime.

2. About the speaker
Stefano Virgilli

4. Photoshop wizards
Randomly from the internet

8. A serious Italian case
Delitto Poggi

10. Spot the photoshopped
1 in 17

13. The trick
Mathematical evidence

19. How it's done
Conceptually

22. How it's done
Step by Step

26. Another example
The deer

31. The deer
A matter of layers