I emulate how to handle images based on two people that I know who are professional web developers. Both of these individuals get a lot of visitors to their site.
It has taking me a while to write the code to handle this because it's basically rocket science to do this semi correctly.
On top of that, I'm not a computer geek. I usually just drunk and attempt to get with the hot looking white women in San Francisco.
Computer programming is just an after thought.