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HeadlessNoWindowsNeeded — wiki

"""How to use pygame with no windowing system, like on headless servers.

Thumbnail generation with scaling is an example of what you can do with pygame.
NOTE: the pygame scale function uses mmx if available, and can be run 
  in multiple threads.

useage = """-scale inputimage outputimage new_width new_height
eg.  -scale in.png out.png 50 50


import os, sys

# set SDL to use the dummy NULL video driver, 
#   so it doesn't need a windowing system.
os.environ["SDL_VIDEODRIVER"] = "dummy"

import pygame.transform

if 1:
    #some platforms might need to init the display for some parts of pygame.
    import pygame.display
    screen = pygame.display.set_mode((1,1))

def scaleit(fin, fout, w, h):
    i = pygame.image.load(fin)

    if hasattr(pygame.transform, "smoothscale"):
        scaled_image = pygame.transform.smoothscale(i, (w,h))
        scaled_image = pygame.transform.scale(i, (w,h)), fout)

if __name__ == "__main__":
    if "-scale" in sys.argv:
        fin, fout, w, h = sys.argv[2:]
        w, h = map(int, [w,h])
        scaleit(fin, fout, w,h)
        print useage