将base64字符串转换为图像并保存

Question

I am trying to convert base64 image data into image file and to save it.

base64_image_str = request.POST.get('base64_image_str')
# it is smthg like: "data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDA......."

with open("newimage.png", "wb") as f:
    f.write(base64_image_str.decode('base64'))
    f.close()

also tried:

f = open("newimage.png", "wb")
f.write(decodestring(base64_image_str))
f.close()

Image is being saved but it is corrupt and cannot open it. What am I doing wrong?

Answer 1

The start of the string, up to the first comma, is information added by POSTing the data, and as such is not part of the base64 encoding of your file. So remove it before decoding.

Answer 2

As you see, the real image data starts off by a comma, you should strip off the remaining part,

base64_image_str = "data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDA......."

base64_image_str = base64_image_str[base64_image_str.find(",")+1:]