PIL：将Bytearray转换为Image [英] PIL: Convert Bytearray to Image

问题描述

我正在尝试使用 Image.open 和 Image.verify（）验证一个bytearray，而不将其写入首先是磁盘然后用 im = Image.open（）打开它。我查看了 .readfrombuffer（）和 .readfromstring（）方法，但我需要图像的大小（我只能在将字节流转换为图像时获得）。

I am trying to verify a bytearray with Image.open and Image.verify() without writing it to disk first and then open it with im = Image.open(). I looked at the .readfrombuffer() and .readfromstring() method, but there I need the size of the image (which I could only get when converting the bytestream to an image).

我的读取功能如下所示：

My Read-Function looks like this:

def readimage(path):
bytes = bytearray()
count = os.stat(path).st_size / 2
with open(path, "rb") as f:
    print "file opened"
    bytes = array('h')
    bytes.fromfile(f, count)
return bytes

然后作为基本测试，我尝试将bytearray转换为图像：

Then as a basic test I try to convert the bytearray to an image:

bytes = readimage(path+extension)
im = Image.open(StringIO(bytes))
im.save(savepath)

如果有人知道我做错了什么，或者是否有更优雅的方式将这些字节转换为这真的对我有帮助。

If someone knows what I am doing wrong or if there is a more elegant way to convert those bytes into an image that'd really help me.

PS：我认为我需要bytearray，因为我对字节进行了操作（故障）他们的图像）。这确实有效，但是我想这样做而不将其写入磁盘，然后再次从磁盘打开图像文件以检查它是否坏了。

P.S.: I thought I need the bytearray because I do manipulations on the bytes (glitch them images). This did work, but I wanted to do it without writing it to disk and then opening the imagefile from the disk again to check if it is broken or not.

编辑：它给我的全部是 IOError：无法识别图像文件

All it gives me is a IOError: cannot identify image file

推荐答案

如果使用 bytearrays 进行操作，则必须使用 io.BytesIO 。您也可以直接将文件读取到 bytearray 。

If you manipulate with bytearrays, then you have to use io.BytesIO. Also you can read a file directly to a bytearray.

import os
import io
import Image
from array import array

def readimage(path):
    count = os.stat(path).st_size / 2
    with open(path, "rb") as f:
        return bytearray(f.read())

bytes = readimage(path+extension)
image = Image.open(io.BytesIO(bytes))
image.save(savepath)

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