This file is what is called a Tutorial, or self teaching lesson.
These types of tutorials can be found by the thousands on the net.
Using this same technique especially when combined with other techniques constitutes "Photo Shopping"!
I use and have for sometime been using Paint Shop Pro. I use PSP, (now Corel PSP) because though PSP has 95% (possibly more) of Adobe Photoshops functionality, it's far cheaper. PSP10, (The newest version) runs about $100 while the latest version of Photoshop will set you back about $650. That's substantial.
(You might be able to find PSP9 for less than $50.)
Because of this price differance, PSP is the software used most often by NON PROFESSIONALS.
(Pro's get kinda snobby, and many use programs like Quark Xpress which costs MUCH more than Adobe!)
Also, Photoshop and PSP are so similar that many aspects of the 2 programs are interchangable.
Anyway, have a look at this tutorial and you can see how we do the magic.
You will also see that YOU can do it too, and I highly encourage you to get the software and have some fun!
Swapping Heads
a sample of face swapping
I think this sample would have worked better if the photoshop artist
had first brightened the Clinton image to match the background image layer,
though the chin shadow is a nice added touch.