This guide provides useful information for migrating applications from SDL_image 2.0 to SDL_image 3.0.
IMG_Init() and IMG_Quit() are no longer necessary. If an image format requires dynamically loading a support library, that will be done automatically.
IMG_GetError() has been replaced with SDL_GetError().
The functions named *_RW() that previously took an SDL_RWops parameter have been renamed *_IO() and take an SDL_IOStream parameter.
IMG_Linked_Version() has been replaced with IMG_Version().