Converta string em base64 para imagem e salve no sistema de arquivos em Python

118

Eu tenho uma string no formato base64, que representa a imagem PNG. Existe uma maneira de salvar esta imagem no sistema de arquivos, como um arquivo PNG?


Codifiquei a imagem usando flex. Na verdade, é isso que obtenho no servidor (não consigo ver nenhuma imagem depois de qualquer um dos métodos propostos :()

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Oleg Tarasenko
fonte
2
Qual é o formato? Um bitmap bruto codificado em base64? Uma imagem PNG com conteúdo codificado em base64?
Ignacio Vazquez-Abrams
Imagem PNG com conteúdo codificado em base64
Oleg Tarasenko
Publiquei o conteúdo da imagem codificada e quebrou o layout. NÃO tenho certeza de como compartilhá-lo de outra maneira
Oleg Tarasenko
1
Usando os dados que você postou acima e meu método abaixo, os dados são convertidos em um arquivo PNG válido. Arquivo em execução nos relatórios de saída: imagem PNG, 1666 x 1666, RGBA 8 bits / cores, não entrelaçado. Quando olho para os dados nos canais, cada canal de RGB e A está completamente preenchido com 0 valores. Portanto, uma imagem preta completamente transparente. Talvez a imagem que você salvou do flex ainda não tenha sido preenchida com dados?
Shane Holloway

Respostas:

237

Começando com

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Decodifique os dados usando o codec base64 e grave-os no sistema de arquivos.

# 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'))

Modernizando este exemplo para Python 3, que removeu o suporte a codec arbitrário de string / bytes .encode() e .decode()funções:

# For both Python 2.7 and Python 3.x
import base64
with open("imageToSave.png", "wb") as fh:
    fh.write(base64.decodebytes(img_data))
Shane Holloway
fonte
Eu carreguei a imagem que recebi de sua string base64 acima. Você pode encontrá-lo em: twitpic.com/15gzaf
Shane Holloway
você pode adicionar mais algum código para fazer o mesmo. como o que é imgData e onde está o método open (), etc e como fazer o mesmo no android?
Raj
3
AttributeError: o objeto 'função' não tem atributo 'decodificar'
Usuário de
1
Este método também funciona para outros formatos binários (PDF, por exemplo)
Será
1
como você faz isso começando com um str não embutido? Não posso fazer b'foobar'porque não estou fazendo a string embutida
Seph Reed
16

Se o imagestr fosse dados de bitmap (que agora sabemos que não são), você poderia usar isso

imagestré a string codificada em base64
widthé a largura da imagem
heighté a altura da imagem

from PIL import Image
from base64 import decodestring

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

Uma vez que a imagem é apenas os dados PNG codificados

from base64 import decodestring

with open("foo.png","wb") as f:
    f.write(decodestring(imagestr))
John La Rooy
fonte
1
Quando tentei a primeira solução, obtive: >>> Traceback (última chamada mais recente): File "/ var / folders / -r / -rpbHh0BHh0dZHYf3pOezU +++ TQ / -Tmp- / py850808Au", linha 8, em <module> image = Image.fromstring ('RGB', (100,100), decodestring (imgData)) Arquivo "/opt/local/lib/python2.5/site-packages/PIL/Image.py", linha 1744, em fromstring im. fromstring (data, decoder_name, args) File "/opt/local/lib/python2.5/site-packages/PIL/Image.py", linha 575, em fromstring raise ValueError ("dados de imagem insuficientes") ValueError: não dados de imagem suficientes >>>
Oleg Tarasenko
@Oleg Tarasenko, cometi um erro de digitação no segundo método. Fixei e testei em sua corda e funciona.
John La Rooy
hm .... tentando: de base64 import decodestring com open ("foo.png", "wb") como f: f.write (decodestring (imgData)) Mas me dá um com open ("foo.png", "wb") como f: ^ SyntaxError: sintaxe inválida
Oleg Tarasenko
1
Eu também tentei: f = open ("foo.png", "wb") f.write (decodestring (imgData)) f.close () Ele salva a imagem foo.png. Na verdade, a imagem é uma coisa cinza vazia. você vê o mesmo?
Oleg Tarasenko
5

Você também pode salvá-lo em um buffer de string e fazer o que quiser com ele,

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!

No django, você pode salvá-lo como um arquivo enviado para salvar em um modelo:

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

Ou envie por e-mail:

email = EmailMessage('Hello', 'Body goes here', '[email protected]',
                                     ['[email protected]', ])
                email.attach('design.png', image_output.read(), 'image/png')
                email.send()
Radtek
fonte
4

Você pode usar travesseiro.

pip install Pillow



image = base64.b64decode(str(base64String))       
fileName = 'test.jpeg'

imagePath = FILE_UPLOAD_DIR + fileName

img = Image.open(io.BytesIO(image))
img.save(imagePath, 'jpeg')
return fileName

referência para o código-fonte completo: https://abhisheksharma.online/convert-base64-blob-to-image-file-in-python/

Abhishek Sharma
fonte
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')
CodeDecode
fonte
0

Você provavelmente poderia usar o objeto do pacote PyPNGpng.Reader para fazer isso - decodificar a string de base64 em uma string regular (por meio da base64biblioteca padrão) e passá-la para o construtor.

Âmbar
fonte
0

Experimente esta solução,

arquivo de imagem -> string codificada binária

string codificada binária -> arquivo de imagem

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))

Referências:

Kushan Gunasekera
fonte
0

Se você está tentando decodificar uma imagem da web, você pode simplesmente usar isto:

import base64

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

data => é a string codificada

Ele cuidará dos erros de preenchimento

VINEE
fonte