红绿灯

平台   MISC   已通过

题目作者: 未知

一　　血: ‌‌‌‌‌dotast

一血奖励: 2金币

解　　决: 364

提　　示:

描　　述: flag{}

附　　件: 下载

站长题解:

from PIL import Image
 
savepath = './temp'

def split_gif():
	im = Image.open('./Traffic_Light.gif')
	try:
		im.save(f'{savepath}/{im.tell()}.jpg')
		while True:
			im.seek(im.tell() + 1)
			im.save(f'{savepath}/{im.tell()}.jpg')
	except:
		im.close()

# split_gif()

binstr = ""
flag = ""

def decode(s):
	return ''.join([chr(i) for i in [int(b, 2) for b in s.split(' ')]])


for i in range(1168):
	image=Image.open(f'{savepath}/{i}.jpg')

	tmp1 = image.getpixel((115,55))
	tmp2 = image.getpixel((115,150))

	if tmp1[0] > 250:
		binstr += '1'
	elif tmp2[1] > 250:
		binstr += '0'
	else:
		binstr += ''
	print (binstr)


for i in range(len(binstr)):
if i % 8 == 0:
	flag += decode(binstr[i:i+8])
print(flag)

去做题