แปลงสตริงใน base64 เป็นรูปภาพและบันทึกในระบบไฟล์ใน Python

ฉันมีสตริงในรูปแบบ base64 ซึ่งแสดงถึงภาพ PNG มีวิธีบันทึกภาพนี้ลงในระบบไฟล์เป็นไฟล์ PNG หรือไม่?

ฉันเข้ารหัสภาพโดยใช้ดิ้น อันที่จริงนี่คือสิ่งที่ฉันได้รับบนเซิร์ฟเวอร์ (ไม่สามารถดูภาพใด ๆ หลังจากวิธีการใด ๆ ที่เสนอ :()

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เริ่มต้นด้วย

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ถอดรหัสข้อมูลโดยใช้ตัวแปลงสัญญาณ base64 จากนั้นเขียนลงในระบบไฟล์

# 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'))

ปรับปรุงตัวอย่างนี้ให้ทันสมัยเป็น Python 3 ซึ่งลบการสนับสนุนตัวแปลงสัญญาณโดยพลการจากสตริง / ไบต์.encode()และ.decode()ฟังก์ชัน:

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

หาก Imagestr เป็นข้อมูลบิตแมป (ซึ่งตอนนี้เรารู้แล้วว่าไม่ใช่) คุณสามารถใช้สิ่งนี้ได้

imagestrคือสตริงที่เข้ารหัส base64
widthคือความกว้างของรูปภาพ
heightคือความสูงของรูปภาพ

from PIL import Image
from base64 import decodestring

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

เนื่องจาก Imagestr เป็นเพียงข้อมูล png ที่เข้ารหัส

from base64 import decodestring

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

คุณยังสามารถบันทึกลงในบัฟเฟอร์สตริงจากนั้นทำตามที่คุณต้องการ

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!

ใน django คุณสามารถบันทึกเป็นไฟล์ที่อัปโหลดเพื่อบันทึกลงในโมเดล:

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

หรือส่งเป็นอีเมล:

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

คุณสามารถใช้หมอน

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

อ้างอิงสำหรับซอร์สโค้ดที่สมบูรณ์: https://abhisheksharma.online/convert-base64-blob-to-image-file-in-python/

 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')

คุณอาจใช้ออบเจ็กต์ของแพ็คเกจ PyPNGpng.Readerเพื่อทำสิ่งนี้ - ถอดรหัสสตริง base64 เป็นสตริงปกติ (ผ่านbase64ไลบรารีมาตรฐาน) และส่งต่อไปยังตัวสร้าง

ลองใช้วิธีนี้

ไฟล์รูปภาพ -> สตริงที่เข้ารหัสไบนารี

สตริงที่เข้ารหัสไบนารี -> ไฟล์รูปภาพ

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))

อ้างอิง:

• การเข้ารหัสไฟล์รูปภาพด้วย base64
• วิธีสร้างภาพไบนารีด้วย python

หากคุณกำลังพยายามถอดรหัสภาพบนเว็บคุณสามารถใช้สิ่งนี้:

import base64

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

data => คือสตริงที่เข้ารหัส

จะดูแลข้อผิดพลาดของช่องว่างภายใน