… At least, I dreamed about it. But what if it happens you need to be ready, at least to ask him an autograph.
But wait, you don’t have a pen, nor a piece of paper but … You got your iPhone or iPad.
For the demonstration purpose, I’ll work on an Easter digital card.
Here’s the step by step
1. Take a smiling picture of an Easter chick
2. Import if into Sketch pro, place the picture where you want
3. Have a transparent layer on top of your image
4. Use your stylus or finger and pick the color for your message/signature
5. Add the picture+signature to “Photos”
And start bragging about it on your Facebook and Twitter.
Chase It Or B Chased 
ce sont de bonnes idees , quand on a pas de papier et stylo,
Detecting changes in a photo is pibsosle nowdays with proper forensics software. For examples, with site you can tell whether a photo has been Photoshopped or not. The software works by doing pattern recognition, since digital camera’s tend to have specific patterns in the pictures they create. Most image manipulations will change these patterns which can be recognised. The software should even be able to give some indications what kind of manipulations have taken place.