python如何读取像素值

COLORREF GetPixel(HDC hdc, int nXPos, int nYPos)

import Image 

import sys  

im = Image.open(sys.argv[1]) 

width = im.size[0] 

height = im.size[1] 

print "/* width:%d */"%(width) 

print "/* height:%d */"%(height) 

count = 0  

for h in range(0, height): 

  for w in range(0, width): 

    pixel = im.getpixel((w, h))  

    for i in range(0,3): 

      count = (count+1)%16 

      if (count == 0):  

        print "0x%02x,/n"%(pixel[i]), 

      else: 

        print "0x%02x,"%(pixel[i]),