得到一个像素点

提取像素点

脚本

from PIL import Image
result = open('1.txt','w+')
img = Image.open("Pixel_Signin.png")
img = img.convert('RGB')
for i in range(31):
    for j in range(31):
        r,g,b = img.getpixel((j,i))
        print(r,g,b,end=' ',file=result)

运行之后得到

把它们转字符

脚本

with open('1.txt', 'r') as f:
    numbers = f.read().split()
    result = ''.join([chr(int(num)) for num in numbers])
    print(result)

运行之后得到

放到随波逐流解码

NSSCTF{Haruki_is_NSS_SUPERMAN_so_this_task_is_easy}