小编b55*_*555的帖子

from PIL import Image
fp="C:\\lena.jpg"
img=Image.open(fp)
w,h=img.size
pixels=img.load()

imgsharp=Image.new(img.mode,img.size,color=0)
sharp=[0,-1,0,-1,8,-1,0,-1,0]

for i in range(w):
    for j in range(h):

        for k in range(3):
                for m in range(3):
                    l=pixels[i-k+1,j-m+1]*sharp[i]

        if l>255:
            l=255
        elif l<0:
            l=0
        imgsharp.putpixel((i,j),l)

imgsharp.show()

我想将3x3蒙版大小的高通（锐化）滤镜应用于灰度图像。但我收到一个错误：

Traceback (most recent call last):
File "C:\sharp.py", line 16, in <module>
l=pixels[i-k+1,j-m+1]*sharp[i]
IndexError: image index out of range

如何解决我的错误以及如何使图像锐化在此代码中起作用？