Convertir une chaîne en base64 en image et enregistrer sur le système de fichiers en Python


118

J'ai une chaîne au format base64, qui représente une image PNG. Existe-t-il un moyen d'enregistrer cette image sur le système de fichiers, sous forme de fichier PNG?


J'ai encodé l'image en utilisant flex. En fait, c'est ce que j'obtiens sur le serveur (je ne peux voir aucune image après l'une des méthodes proposées :()

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2
De quel format s'agit-il? Un bitmap brut encodé en base64? Une image PNG avec le contenu encodé en base64?
Ignacio Vazquez-Abrams

Image PNG avec le contenu encodé en base64
Oleg Tarasenko

J'ai posté le contenu de l'image encodée et cela a cassé la mise en page. Je ne sais pas comment le partager de l'autre manière
Oleg Tarasenko

1
En utilisant les données que vous avez publiées ci-dessus et ma méthode ci-dessous, les données sont converties en un fichier png valide. Fichier en cours d'exécution sur les rapports de sortie: image PNG, 1666 x 1666, 8 bits / couleur RGBA, non entrelacé. Lorsque je regarde les données dans les canaux, chaque canal de RVB et A est complètement rempli de valeurs 0. Ainsi une image noire complètement transparente. Peut-être que l'image que vous avez enregistrée à partir de flex n'a pas encore été remplie de données?
Shane Holloway le

Réponses:


237

Commençant par

img_data = 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Décodé les données à l'aide du codec base64, puis les écrire dans le système de fichiers.

# 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'))

Modernisation de cet exemple vers Python 3, qui a supprimé la prise en charge arbitraire des codecs des chaînes / octets .encode()et des .decode()fonctions:

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

J'ai téléchargé l'image que j'ai obtenue à partir de votre chaîne base64 ci-dessus. Vous pouvez le trouver sur: twitpic.com/15gzaf
Shane Holloway

pouvez-vous ajouter du code pour faire de même. comme qu'est-ce que imgData et où est la méthode open (), etc. et comment faire la même chose dans Android?
Raj

3
AttributeError: l'objet 'function' n'a pas d'attribut 'decode'
Utilisateur

1
Cette méthode fonctionne également pour d'autres formats binaires (PDF par exemple)
Will

1
comment faites-vous cela en commençant par un str non-inline? Je ne peux pas faire b'foobar'parce que je ne fais pas la chaîne en ligne
Seph Reed

16

Si l'imagestr était des données bitmap (ce que nous savons maintenant que ce n'est pas le cas), vous pouvez l'utiliser

imagestrest la chaîne encodée en base64
widthest la largeur de l'image
heightest la hauteur de l'image

from PIL import Image
from base64 import decodestring

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

Puisque l'imagestr n'est que les données png encodées

from base64 import decodestring

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

1
Quand j'ai essayé la première solution, j'ai obtenu: >>> Traceback (dernier appel le plus récent): File "/ var / folders / -r / -rpbHh0BHh0dZHYf3pOezU +++ TQ / -Tmp- / py850808Au", ligne 8, dans <module> image = Image.fromstring ('RGB', (100,100), decodestring (imgData)) Fichier "/opt/local/lib/python2.5/site-packages/PIL/Image.py", ligne 1744, dans fromstring im. fromstring (data, decoder_name, args) File "/opt/local/lib/python2.5/site-packages/PIL/Image.py", ligne 575, dans fromstring lever ValueError ("pas assez de données d'image") ValueError: not assez de données d'image >>>
Oleg Tarasenko

@Oleg Tarasenko, j'ai eu une faute de frappe dans la deuxième méthode. Je l'ai testé et testé sur votre chaîne et cela fonctionne.
John La Rooy

hm .... essayer: à partir du décodage d'importation base64 avec open ("foo.png", "wb") comme f: f.write (decodestring (imgData)) Mais ça me donne un avec open ("foo.png", "wb") as f: ^ SyntaxError: synta invalide
Oleg Tarasenko

1
J'ai aussi essayé: f = open ("foo.png", "wb") f.write (decodestring (imgData)) f.close () Il enregistre l'image foo.png. En fait, l'image est une chose grise vide. voyez-vous la même chose?
Oleg Tarasenko le

5

Vous pouvez également l'enregistrer dans un tampon de chaîne et en faire ce que vous souhaitez,

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!

Dans django, vous pouvez l'enregistrer en tant que fichier téléchargé pour l'enregistrer dans un modèle:

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

Ou envoyez-le par e-mail:

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

Vous pourriez probablement utiliser le de package PyPNG png.Readerl'objet pour le faire - décoder la chaîne base64 dans une chaîne régulière (via la base64bibliothèque standard), et le transmettre au constructeur.


0

Essayez cette solution,

fichier image -> chaîne codée en binaire

chaîne codée en binaire -> fichier image

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))

Références:


0

Si vous essayez de décoder une image Web, vous pouvez simplement utiliser ceci:

import base64

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

data => est la chaîne encodée

Il s'occupera des erreurs de remplissage

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