I’ve always been fascinated by these large backgrounds you sometimes find on movie websites. They can be a real eye catcher. But the problem most people tend to ignore are to make the contour of their image the same colour as their background. A bad example would be like this:

Another problem that frequently occurs is [...]

“Sprites were originally invented as a method of quickly compositing several images together in two-dimensional video games using special hardware.”
Sprites were used back in the Nintendo age. Developpers used them to prevent loading several images each time a character moved or entered the screen. All movements/characters were set on one big image and by using [...]