#! /usr/bin/env python

import pygame, sys
WAIT = pygame.KEYDOWN, pygame.QUIT

pygame.display.init()
im = pygame.image.load(sys.argv[1])
screen = pygame.display.set_mode(im.get_size())
im = im.convert_alpha()

for c in range(256):
    screen.fill((c,c,c))
    screen.blit(im, (0,0))
    pygame.display.flip()
    if pygame.event.poll().type in WAIT: break
else:
    while pygame.event.wait().type not in WAIT: pass