Python 如何将base64字符串转换为图像？
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How to convert base64 string to image?
提问by omarsafwany
I'm converting an image to base64string and sending it from android device to the server. Now, I need to change that string back to an image and save it in the database.
我正在将图像转换为base64字符串并将其从 android 设备发送到服务器。现在，我需要将该字符串改回图像并将其保存在数据库中。
Any help?
有什么帮助吗？
采纳答案by rmunn
Try this:
尝试这个：
import base64
imgdata = base64.b64decode(imgstring)
filename = 'some_image.jpg' # I assume you have a way of picking unique filenames
with open(filename, 'wb') as f:
f.write(imgdata)
# f gets closed when you exit the with statement
# Now save the value of filename to your database
回答by pypat
This should do the trick:
这应该可以解决问题：
image = open("image.png", "wb")
image.write(base64string.decode('base64'))
image.close()
回答by Fernando Mota
Just use the method .decode('base64')and go to be happy.
只需使用该方法.decode('base64')并获得快乐。
You need, too, to detect the mimetype/extension of the image, as you can save it correctly, in a brief example, you can use the code below for a django view:
您还需要检测图像的 mimetype/extension，因为您可以正确保存它，在一个简短的示例中，您可以使用下面的代码进行 django 视图：
def receive_image(req):
image_filename = req.REQUEST["image_filename"] # A field from the Android device
image_data = req.REQUEST["image_data"].decode("base64") # The data image
handler = open(image_filename, "wb+")
handler.write(image_data)
handler.close()
And, after this, use the file saved as you want.
然后，根据需要使用保存的文件。
Simple. Very simple. ;)
简单的。很简单。;)
回答by Jumabek Alikhanov
Return converted image without saving:
返回转换后的图像而不保存：
from PIL import Image
import cv2
# Take in base64 string and return cv image
def stringToRGB(base64_string):
imgdata = base64.b64decode(str(base64_string))
image = Image.open(io.BytesIO(imgdata))
return cv2.cvtColor(np.array(image), cv2.COLOR_BGR2RGB)
回答by Anthony Anyanwu
You can try using open-cv to save the file since it helps with image type conversions internally. The sample code:
您可以尝试使用 open-cv 来保存文件，因为它有助于在内部进行图像类型转换。示例代码：
import cv2
import numpy as np
def save(encoded_data, filename):
nparr = np.fromstring(encoded_data.decode('base64'), np.uint8)
img = cv2.imdecode(nparr, cv2.IMREAD_ANYCOLOR)
return cv2.imwrite(filename, img)
Then somewhere in your code you can use it like this:
然后在您的代码中的某个地方，您可以像这样使用它：
save(base_64_string, 'testfile.png');
save(base_64_string, 'testfile.jpg');
save(base_64_string, 'testfile.bmp');
