第28关
RING-RING-RING，读着读着就变成了GREEN. green.html里提示yes, green.
仔细观察一下图片，发现里面有一条条的绿色竖纹。将图片的Green通道提取出来，相邻的两列像素作差，得到的差值的绝对值几乎都为42，只有少数例外。将绝对值不是42的提取出来，转成ASCII，得到通关信息——Python作者的姓名Guido van Rossum中的guido
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| from PIL import Image
import numpy as np
im = Image.open('bell.png')
imdata = list(im.getdata())
imdata = np.array(imdata)
size = im.size
imdata = imdata.reshape((size[1], size[0], -1))
imdata_g = imdata[:, :, 1]
diff = np.abs(imdata_g[:, 0::2] - imdata_g[:, 1::2])
idx = np.where(diff != 42)
msg = diff[idx]
print ''.join(chr(i) for i in msg)
print 'Guido van Rossum'.split()[0]
|
下一关 http://www.pythonchallenge.com/pc/ring/guido.html
参考