Converti la stringa in base64 in immagine e salva sul filesystem in Python


118

Ho una stringa in formato base64, che rappresenta l'immagine PNG. C'è un modo per salvare questa immagine nel filesystem, come file PNG?


Ho codificato l'immagine usando flex. In realtà questo è ciò che ottengo sul server (non posso vedere alcuna immagine dopo nessuno dei metodi proposti :()

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2
Che formato è? Una bitmap raw con codifica base64? Un'immagine PNG con il contenuto codificato in base64?
Ignacio Vazquez-Abrams

Immagine PNG con contenuto codificato in base64
Oleg Tarasenko

Ho pubblicato il contenuto dell'immagine codificata e ha rotto il layout. Non sono sicuro di come condividerlo nell'altro modo
Oleg Tarasenko

1
Utilizzando i dati che hai pubblicato sopra e il mio metodo di seguito, i dati vengono convertiti in un file png valido. File in esecuzione sui rapporti di output: immagine PNG, 1666 x 1666, RGBA a 8 bit / colore, non interlacciato. Quando guardo i dati nei canali, ogni canale di RGB e A è completamente riempito con valori 0. Quindi un'immagine nera completamente trasparente. Forse l'immagine che hai salvato da Flex non era ancora popolata di dati?
Shane Holloway

Risposte:


237

Iniziare con

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Ha decodificato i dati utilizzando il codec base64, quindi li ha scritti nel filesystem.

# 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'))

Modernizzare questo esempio in Python 3, che ha rimosso il supporto di codec arbitrari da stringhe / byte .encode()e .decode()funzioni:

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

Ho caricato l'immagine che ottengo dalla tua stringa base64 sopra. Puoi trovarlo su: twitpic.com/15gzaf
Shane Holloway,

puoi aggiungere altro codice per fare lo stesso. come cos'è imgData e dov'è il metodo open (), ecc. e come fare lo stesso in Android?
Raj

3
AttributeError: l'oggetto "function" non ha l'attributo "decode"
Utente

1
Questo metodo funziona anche per altri formati binari (PDF ad esempio)
sarà il

1
come si fa a iniziare con una str non in linea? Non posso farlo b'foobar'perché non sto rendendo la stringa in linea
Seph Reed

16

Se il imagestr fosse dati bitmap (che ora sappiamo che non lo è) potresti usarlo

imagestrè la stringa codificata in base64
widthè la larghezza dell'immagine
heightè l'altezza dell'immagine

from PIL import Image
from base64 import decodestring

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

Poiché imagestr è solo i dati png codificati

from base64 import decodestring

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

1
Quando ho provato la prima soluzione ho ottenuto: >>> Traceback (chiamata più recente per ultima): File "/ var / folders / -r / -rpbHh0BHh0dZHYf3pOezU +++ TQ / -Tmp- / py850808Au", riga 8, in <module> image = Image.fromstring ('RGB', (100,100), decodestring (imgData)) File "/opt/local/lib/python2.5/site-packages/PIL/Image.py", riga 1744, in fromstring im. fromstring (data, decoder_name, args) File "/opt/local/lib/python2.5/site-packages/PIL/Image.py", riga 575, in fromstring raise ValueError ("dati immagine insufficienti") ValueError: not dati immagine sufficienti >>>
Oleg Tarasenko

@Oleg Tarasenko, ho avuto un errore di battitura nel secondo metodo. L'ho fiexato e testato sulla tua corda e funziona.
John La Rooy,

hm .... try: from base64 importa decodestring with open ("foo.png", "wb") as f: f.write (decodestring (imgData)) Ma mi dà un con open ("foo.png", "wb") come f: ^ SyntaxError: sintassi non valida
Oleg Tarasenko

1
Ho anche provato: f = open ("foo.png", "wb") f.write (decodestring (imgData)) f.close () Salva l'immagine foo.png. In realtà l'immagine è vuota cosa grigia. vedi lo stesso?
Oleg Tarasenko

5

Puoi anche salvarlo in un buffer di stringhe e quindi farlo come desideri,

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!

In django, puoi salvarlo come file caricato per salvarlo su un modello:

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

Oppure invialo come 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

Prova questa soluzione,

file immagine -> stringa con codifica binaria

stringa codificata binaria -> file immagine

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))

Riferimenti:


0

Se stai cercando di decodificare un'immagine web puoi semplicemente usare questo:

import base64

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

data => è la stringa codificata

Si prenderà cura degli errori di riempimento

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