libsprite

The library libsprite is very good for real-time sprite creation and manipulation, there is some filters, effects, copy/paste, transparency capabilities and so on, you can also write you sprite in a sprt format, that will be a little quicker to load them

It can be helpful if you make a game that need to manipulate a lot of texture and if you have to apply many effects on

There is an example program to test the library and to help you to learn and see how to use it, look at the prototypes in libsprite.h, you'll see, it's very easy to use