The sdl.image module exposes the SDL_image API without the IMG_ prefix.
See also http://www.libsdl.org/projects/SDL_image/
int IMG_isPNG(SDL_RWops *)
SDL_Surface * IMG_Load(char const *)
int IMG_isTIF(SDL_RWops *)
SDL_Surface * IMG_LoadPNG_RW(SDL_RWops *)
SDL_Texture * IMG_LoadTextureTyped_RW(SDL_Renderer *, SDL_RWops *, int, char const *)
int IMG_isXCF(SDL_RWops *)
SDL_Surface * IMG_LoadJPG_RW(SDL_RWops *)
int IMG_isXV(SDL_RWops *)
int IMG_SavePNG_RW(SDL_Surface *, SDL_RWops *, int)
int IMG_isICO(SDL_RWops *)
SDL_Surface * IMG_LoadBMP_RW(SDL_RWops *)
void IMG_Quit(void)
int IMG_SavePNG(SDL_Surface *, char const *)
SDL_Surface * IMG_LoadLBM_RW(SDL_RWops *)
SDL_Surface * IMG_LoadXPM_RW(SDL_RWops *)
SDL_Surface * IMG_LoadPNM_RW(SDL_RWops *)
int IMG_isJPG(SDL_RWops *)
int IMG_Init(int)
int IMG_isWEBP(SDL_RWops *)
SDL_Surface * IMG_LoadTIF_RW(SDL_RWops *)
int IMG_isPNM(SDL_RWops *)
SDL_Surface * IMG_LoadPCX_RW(SDL_RWops *)
SDL_Surface * IMG_ReadXPMFromArray(char * *)
SDL_Surface * IMG_LoadICO_RW(SDL_RWops *)
SDL_Texture * IMG_LoadTexture(SDL_Renderer *, char const *)
int IMG_isPCX(SDL_RWops *)
SDL_Surface * IMG_LoadXV_RW(SDL_RWops *)
SDL_Surface * IMG_LoadWEBP_RW(SDL_RWops *)
SDL_Surface * IMG_Load_RW(SDL_RWops *, int)
SDL_Surface * IMG_LoadTGA_RW(SDL_RWops *)
SDL_Surface * IMG_LoadXCF_RW(SDL_RWops *)
int IMG_isCUR(SDL_RWops *)
int IMG_isBMP(SDL_RWops *)
SDL_Surface * IMG_LoadCUR_RW(SDL_RWops *)
SDL_Surface * IMG_LoadGIF_RW(SDL_RWops *)
SDL_version const * IMG_Linked_Version(void)
int IMG_isLBM(SDL_RWops *)
SDL_Surface * IMG_LoadTyped_RW(SDL_RWops *, int, char const *)
SDL_Texture * IMG_LoadTexture_RW(SDL_Renderer *, SDL_RWops *, int)
int IMG_isXPM(SDL_RWops *)
int IMG_isGIF(SDL_RWops *)