Chuyển đổi chuỗi trong base64 thành hình ảnh và lưu trên hệ thống tệp bằng Python


117

Tôi có một chuỗi ở định dạng base64, đại diện cho hình ảnh PNG. Có cách nào để lưu hình ảnh này vào hệ thống tệp, dưới dạng tệp PNG không?


Tôi mã hóa hình ảnh bằng flex. Trên thực tế, đây là những gì tôi nhận được trên máy chủ (không thể nhìn thấy bất kỳ hình ảnh nào sau bất kỳ phương pháp được đề xuất nào :()

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2
Nó là định dạng gì? Một bitmap thô được mã hóa base64? Một hình ảnh PNG có nội dung được mã hóa base64?
Ignacio Vazquez-Abrams

Hình ảnh PNG với nội dung được mã hóa base64
Oleg Tarasenko

Tôi đã đăng nội dung của hình ảnh được mã hóa, và nó đã phá vỡ bố cục. KHÔNG chắc làm thế nào để chia sẻ nó theo cách khác
Oleg Tarasenko

1
Sử dụng dữ liệu bạn đã đăng ở trên và phương pháp của tôi bên dưới, dữ liệu chuyển đổi thành tệp png hợp lệ. Tệp đang chạy trên báo cáo đầu ra: hình ảnh PNG, 1666 x 1666, 8-bit / màu RGBA, không xen kẽ. Khi tôi nhìn vào dữ liệu trong các kênh, mỗi kênh RGB và A được lấp đầy bằng 0 giá trị. Do đó, một hình ảnh hoàn toàn trong suốt màu đen. Có lẽ hình ảnh bạn lưu từ flex chưa được điền dữ liệu?
Shane Holloway

Câu trả lời:


237

Bắt đầu với

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Đã giải mã dữ liệu bằng cách sử dụng codec base64, sau đó ghi nó vào hệ thống tệp.

# In Python 2.7
fh = open("imageToSave.png", "wb")
fh.write(img_data.decode('base64'))
fh.close()

# or, more concisely using with statement
with open("imageToSave.png", "wb") as fh:
    fh.write(img_data.decode('base64'))

Hiện đại hóa ví dụ này thành Python 3, đã loại bỏ hỗ trợ codec tùy ý khỏi chuỗi / byte .encode()và các .decode()hàm:

# For both Python 2.7 and Python 3.x
import base64
with open("imageToSave.png", "wb") as fh:
    fh.write(base64.decodebytes(img_data))

Tôi đã tải lên hình ảnh mà tôi nhận được từ chuỗi base64 của bạn ở trên. Bạn có thể tìm thấy nó tại: twitpic.com/15gzaf
Shane Holloway

bạn có thể thêm một số mã nữa để làm tương tự. như imgData là gì và phương thức open () ở đâu, v.v. và làm thế nào để làm điều tương tự trong Android?
Raj

3
AttributeError: Đối tượng 'chức năng' không có thuộc tính 'giải mã'
Người dùng

1
Phương pháp này cũng hoạt động đối với các định dạng nhị phân khác (ví dụ: PDF)
Sẽ

1
làm thế nào để bạn làm điều này bắt đầu với một str không phải nội tuyến? Tôi không thể làm b'foobar'vì tôi không làm cho chuỗi inline
Seph Reed

16

Nếu hình ảnh là dữ liệu bitmap (mà bây giờ chúng tôi biết nó không phải), bạn có thể sử dụng

imagestrlà chuỗi được mã hóa base64
widthlà chiều rộng của hình ảnh
heightlà chiều cao của hình ảnh

from PIL import Image
from base64 import decodestring

image = Image.fromstring('RGB',(width,height),decodestring(imagestr))
image.save("foo.png")

Vì hình ảnh chỉ là dữ liệu png được mã hóa

from base64 import decodestring

with open("foo.png","wb") as f:
    f.write(decodestring(imagestr))

1
Khi tôi thử giải pháp đầu tiên, tôi nhận được: >>> Traceback (lần gọi gần đây nhất): Tệp "/ var / folder / -r / -rpbHh0BHh0dZHYf3pOezU +++ TQ / -Tmp- / py850808Au", dòng 8, trong <module> image = Image.fromstring ('RGB', (100,100), decodestring (imgData)) Tệp "/opt/local/lib/python2.5/site-packages/PIL/Image.py", dòng 1744, trong fromstring im. fromstring (data, decoder_name, args) Tệp "/opt/local/lib/python2.5/site-packages/PIL/Image.py", dòng 575, trong fromstring nâng ValueError ("không đủ dữ liệu hình ảnh") ValueError: not đủ dữ liệu hình ảnh >>>
Oleg Tarasenko

@Oleg Tarasenko, tôi đã mắc lỗi đánh máy trong phương pháp thứ hai. Tôi đã kiểm tra nó và thử nghiệm nó trên chuỗi của bạn và nó hoạt động.
John La Rooy

hm .... đang thử: from base64 import decodestring with open ("foo.png", "wb") as f: f.write (decodestring (imgData)) Nhưng nó cho tôi biết với open ("foo.png", "wb") as f: ^ Cú pháp Lỗi: cú pháp không hợp lệ
Oleg Tarasenko

1
Tôi cũng đã thử: f = open ("foo.png", "wb") f.write (decodestring (imgData)) f.close () Nó lưu hình ảnh foo.png. Trên thực tế, hình ảnh là thứ trống rỗng màu xám. bạn có thấy giống nhau không?
Oleg Tarasenko

5

Bạn cũng có thể lưu nó vào một bộ đệm chuỗi và sau đó làm như bạn muốn với nó,

import cStringIO
data = json.loads(request.POST['imgData'])  # Getting the object from the post request
image_output = cStringIO.StringIO()
image_output.write(data.decode('base64'))   # Write decoded image to buffer
image_output.seek(0)  # seek beginning of the image string
# image_output.read()  # Do as you wish with it!

Trong django, bạn có thể lưu nó dưới dạng tệp tải lên để lưu vào mô hình:

from django.core.files.uploadedfile import SimpleUploadedFile
suf = SimpleUploadedFile('uploaded_file.png', image_output.read(), content_type='image/png')

Hoặc gửi nó dưới dạng email:

email = EmailMessage('Hello', 'Body goes here', 'from@example.com',
                                     ['me@me.com', ])
                email.attach('design.png', image_output.read(), 'image/png')
                email.send()


4
 import base64
 from PIL import Image
 import io
 image = base64.b64decode(str('stringdata'))       
 fileName = 'test.jpeg'

 imagePath = ('D:\\base64toImage\\'+"test.jpeg")
 img = Image.open(io.BytesIO(image))
 img.save(imagePath, 'jpeg')


0

Hãy thử giải pháp này,

tệp hình ảnh -> chuỗi mã hóa nhị phân

chuỗi mã hóa nhị phân -> tệp hình ảnh

import base64

"""
1st step - convert image into binary
"""
with open("original_image.png", "rb") as original_file:
    encoded_string = base64.b64encode(original_file.read())

print(encoded_string)
# xmzWowsfJbpGwCe0DTveqwvos7Mf0lcVNe/Q+G1hO/p+UNPd/stUse8AhP/3fDixf8HI3No67nvhlYAAAAASUVORK5CYII='

print(type(encoded_string))
# <class 'bytes'>

"""
2nd step - create new image using the encoded string
"""
with open("new_image.png", "wb") as new_file:
    new_file.write(base64.decodebytes(encoded_string))

Người giới thiệu:


0

Nếu bạn đang cố gắng giải mã một hình ảnh web, bạn có thể chỉ cần sử dụng điều này:

import base64

with open("imageToSave.png", "wb") as fh:
  fh.write(base64.urlsafe_b64decode('data'))

data => là chuỗi mã hóa

Nó sẽ xử lý các lỗi đệm

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