Ubah string dalam base64 menjadi gambar dan simpan di sistem file dengan Python


118

Saya memiliki string dalam format base64, yang mewakili gambar PNG. Apakah ada cara untuk menyimpan gambar ini ke sistem file, sebagai file PNG?


Saya mengkodekan gambar menggunakan flex. Sebenarnya ini yang saya dapatkan di server (tidak dapat melihat gambar apa pun setelah salah satu metode yang diusulkan :()

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2
Format apa Bitmap mentah berenkode base64? Gambar PNG dengan konten berenkode base64?
Ignacio Vazquez-Abrams

Gambar PNG dengan konten yang dikodekan base64
Oleg Tarasenko

Saya memposting konten gambar yang disandikan, dan itu merusak tata letaknya. TIDAK yakin bagaimana membagikannya dengan cara lain
Oleg Tarasenko

1
Dengan menggunakan data yang Anda posting di atas dan metode saya di bawah, data diubah menjadi file png yang valid. Menjalankan file pada laporan keluaran: gambar PNG, 1666 x 1666, 8-bit / color RGBA, non-interlaced. Ketika saya melihat data di saluran, setiap saluran RGB dan A terisi penuh dengan nilai 0. Jadi gambar hitam benar-benar transparan. Mungkin gambar yang Anda simpan dari flex belum diisi dengan data?
Shane Holloway

Jawaban:


237

Dimulai dengan

img_data = 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Mendekodekan data menggunakan codec base64, dan kemudian menuliskannya ke sistem file.

# 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'))

Memodernisasi contoh ini ke Python 3, yang menghapus dukungan codec arbitrer dari string / byte .encode()dan .decode()fungsi:

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

Saya telah mengunggah gambar yang saya dapatkan dari string base64 Anda di atas. Anda dapat menemukannya di: twitpic.com/15gzaf
Shane Holloway

dapatkah Anda menambahkan beberapa kode lagi untuk melakukan hal yang sama. seperti apa itu imgData dan di mana metode open (), dll dan bagaimana melakukan hal yang sama di android?
Raj

3
AttributeError: objek 'function' tidak memiliki atribut 'decode'
Pengguna

1
Metode ini juga berfungsi untuk format biner lain (misalnya PDF)
Akan

1
bagaimana Anda melakukan ini dimulai dengan str non-inline? Saya tidak dapat melakukannya b'foobar'karena saya tidak membuat string sebaris
Seph Reed

16

Jika imagestr adalah data bitmap (yang sekarang kita tahu bukan), Anda dapat menggunakan ini

imagestradalah string yang dikodekan base64
widthadalah lebar gambar
heightadalah tinggi gambar

from PIL import Image
from base64 import decodestring

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

Karena imagestr hanyalah data png yang dikodekan

from base64 import decodestring

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

1
Ketika saya mencoba solusi pertama, saya mendapat: >>> Traceback (panggilan terakhir terakhir): File "/ var / folder / -r / -rpbHh0BHh0dZHYf3pOezU +++ TQ / -Tmp- / py850808Au", baris 8, di <module> image = Image.fromstring ('RGB', (100.100), decodestring (imgData)) File "/opt/local/lib/python2.5/site-packages/PIL/Image.py", baris 1744, di fromstring im. fromstring (data, decoder_name, args) File "/opt/local/lib/python2.5/site-packages/PIL/Image.py", baris 575, dalam fromstring naikkan ValueError ("tidak cukup data gambar") ValueError: tidak cukup data gambar >>>
Oleg Tarasenko

@ Oleg Tarasenko, saya mengalami kesalahan ketik pada metode kedua. Saya fiexed dan mengujinya pada string Anda dan berhasil.
John La Rooy

hm .... mencoba: dari base64 import decodestring dengan open ("foo.png", "wb") sebagai f: f.write (decodestring (imgData)) Tapi itu memberi saya dengan open ("foo.png", "wb") sebagai f: ^ SyntaxError: sintaks tidak valid
Oleg Tarasenko

1
Saya juga mencoba: f = open ("foo.png", "wb") f.write (decodestring (imgData)) f.close () Ini menyimpan gambar foo.png. Sebenarnya gambar itu adalah benda abu-abu kosong. apakah kamu melihat hal yang sama
Oleg Tarasenko

5

Anda juga dapat menyimpannya ke buffer string dan kemudian melakukan apa yang Anda inginkan,

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!

Di django, Anda dapat menyimpannya sebagai file yang diunggah untuk disimpan ke model:

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

Atau kirimkan sebagai 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

Anda mungkin bisa menggunakan PyPNG paket ini png.Readerobjek untuk melakukan hal ini - decode string base64 menjadi string biasa (melalui base64perpustakaan standar), dan menyebarkannya ke konstruktor.


0

Coba solusi ini,

file gambar -> string yang dikodekan biner

string yang dikodekan biner -> file gambar

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))

Referensi:


0

Jika Anda mencoba memecahkan kode gambar web, Anda cukup menggunakan ini:

import base64

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

data => adalah string yang dikodekan

Ini akan menangani kesalahan padding

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