A JPEG is like a sandwich you get at the lunch counter.
You order a ham and cheese with extra bacon, on a seedless bun, and you get exactly that. You really can't do much with it to change it other than scrape off some of the ingredients. And you can't change anything because all the kitchen has in the pantry is ham, bacon, cheese and seedless buns.
Raw, however, is like having access to the supplier of the cafe. If you don't want ham & cheese with extra bacon, you can swap out the ham for turkey. And what kind of cheese would you like....American? Swiss? Colby? Would you like your bacon crispy or soggy? Bun or sliced bread? White or wheat?
Don't like sandwiches? How about some beef stew. Or potato soup. Or a hot beef w/mashed potatoes and gravy.
How about a side of fries? Regular or curly? Iced tea, or soda? And a nice slice of apple pie? Sure, and warm it up. With a dallop of ice cream. And cinnamon all over it.
Bloody starving hungry now...