pygame包中的image類提供了許多圖形轉化的方法：
1.pygame.image.frombuffer(string, size, format): return Surface
create a new Surface that shares data inside a string buffer
2.pygame.image.fromstring(string, size, format, flipped=False): return Surface
create new Surface from a string buffer
3.pygame.image.get_extended(): return bool
test if extended image formats can be loaded
4.pygame.image.load()=pygame.image.load_extended()
pygame module for image transfer
5.pygame.image.load(filename): return Surface
pygame.image.load(fileobj, namehint=): return Surface
load new image from a file
6.pygame.image.save(Surface, filename): return None
save an image to disk
7.save_extended(...)
pygame module for image transfer
8.pygame.image.tostring(Surface, format, flipped=False): return string
transfer image to string buffer