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CTFlearn-Image Magic
阅读量:312 次
发布时间:2019-03-03

本文共 897 字,大约阅读时间需要 2 分钟。

It looks like someone messed up my picture! Can anyone reorganize the pixels? The python module PIL (Python Imaging Library) might be useful! https://mega.nz/#!OKxByZyT!vaabCJRG5D9zAUp7drTekcA5pszu67r_TbQMtxEzqGE

Update: I think whoever messed up my image took every column of pixels and put them side by side. Update: I think the width of the image was 304 before they messed with it.

一道PIL编程问题, 顺便把PIL各个接口学了, 关于编辑image, 需要的接口有new(“RGB”, (x, y)), Image.size是行和列, 看大小发现是一行27986个像素点的一维图片, 题目说每行304个, 所以一共92行, 转换成原图, 脚本如下

from PIL import ImageIm =  Image.open("out copy.jpg")Img_flag = Image.new("RGB", (500, 500))fx, fy = 0, 0rows = Im.size[0]for i in range(rows):    r, g, b = Im.getpixel((i, 0))    fx = (i % 92) # 27968 // 304 == 92    if i % 92 == 0: fy += 1 # 增加一行    Img_flag.putpixel((fy, fx), (r, g, b)) # fx, fy发现图片旋转了90度, 对换一下x, yImg_flag.show()Img_flag.save("flag.jpg")

在这里插入图片描述

flag{cool_right?}

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