Python:如何将图像转换为STRING并返回? [英] Python: How to turn an IMAGE into a STRING and back?

问题描述

我有一个图片像这样加载到PIL.Image中:

I have an image like this loaded into a PIL.Image:

现在我想将其转换为 python字符串，并且它不应该是二进制的，我该怎么做? 因为当我尝试编码时，出现以下错误:

And now I want to turn it into a python string, and it should not be binary, how do I do this? Because when I tried to encode I get the following error:

我的代码:

from PIL import Image

img = Image.open("testImage.jpeg")
string = img.tobytes()
string = string.decode("ascii")

输出:

Traceback (most recent call last):
  File "/Users/tomschimansky/Desktop/SenderMAIN.py", line 5, in <module>
    string = string.decode("ascii")
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 0: ordinal not in range(128)

当此方法有效时，我还想将字符串变回图像.

When this works I also want to turn the string back into an image.

对我来说也不起作用的其他方法:

Other methods that also don't worked for me:

• 直接使用open("file","rb")从文件中读取图像，然后对其进行编码.
• 使用codecs库对其进行编码. (string = codecs.encode(string, "base64"))
• 使用base64库对其进行编码(能够将其转换为字符串，但是字符串看起来像这样:///////.(仅斜线))

• Read the image directly from file with open("file","rb") and then encode it.
• encode it with the codecs library. (string = codecs.encode(string, "base64"))
• encode it with the base64 library (was able to convert it to string but the string looked like this: ///////. (only slashes))

感谢您的回答！

推荐答案

您可以转换为这样的字符串:

You can convert to a string like this:

import base64

with open("image.png", "rb") as image:
    b64string = base64.b64encode(image.read())

这应该为您提供与在Terminal中运行此结果相同的结果:

That should give you the same results as if you run this in Terminal:

base64 < image.png

您可以像这样将字符串转换回PIL图像:

And you can convert that string back to a PIL Image like this:

from PIL import Image
import io

f = io.BytesIO(base64.b64decode(b64string))
pilimage = Image.open(f)

这应该等同于终端机中的以下内容:

That should be equivalent to the following in Terminal:

base64 -D < "STRING" > recoveredimage.png

---

请注意，如果要通过LoRa发送此文件，则最好发送文件的PNG编码版本，就像我在这里一样，因为它已压缩并且会花费更少的时间.或者，您可以发送文件的扩展内存版本，但该文件的内存版本将扩大近50％. PNG文件为13kB.扩展后的内存版本将为100 * 60 * 3或18kB.

---

Note that if you are sending this over LoRa, you are better off sending the PNG-encoded version of the file like I am here as it is compressed and will take less time. You could, alternatively, send the expanded out in-memory version of the file but that would be nearly 50% larger. The PNG file is 13kB. The expanded out in-memory version will be 100*60*3, or 18kB.

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