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Python: Convert string in base64 to image and save on filesystem

Answer 1

A:

You could probably use the PyPNG package's png.Reader object to do this - decode the base64 string into a regular string (via the base64 standard library), and pass it to the constructor.

Amber 2010-02-24 01:54:28

Answer 2

+2 A:

If the imagestr was bitmap data (which we now know it isn't) you could use this

imagestr is the base64 encoded string
width is the width of the image
height is the height of the image

from PIL import Image
from base64 import decodestring

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

Since the imagestr is just the encoded png data

from base64 import decodestring

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

gnibbler 2010-02-24 02:11:23

When I tried first solution I got:>>> Traceback (most recent call last): File "/var/folders/-r/-rpbHh0BHh0dZHYf3pOezU+++TQ/-Tmp-/py850808Au", line 8, in <module> image = Image.fromstring('RGB',(100,100),decodestring(imgData)) File "/opt/local/lib/python2.5/site-packages/PIL/Image.py", line 1744, in fromstring im.fromstring(data, decoder_name, args) File "/opt/local/lib/python2.5/site-packages/PIL/Image.py", line 575, in fromstring raise ValueError("not enough image data")ValueError: not enough image data>>>

Oleg Tarasenko 2010-02-25 20:43:53

@Oleg Tarasenko, I had a typo in the second method. I fiexed it and tested it on your string and it works.

gnibbler 2010-02-25 21:13:46

hm.... trying:from base64 import decodestringwith open("foo.png","wb") as f: f.write(decodestring(imgData))But it gives me a with open("foo.png","wb") as f: ^SyntaxError: invalid synta

Oleg Tarasenko 2010-02-26 05:44:57

I also tried:f = open("foo.png", "wb")f.write(decodestring(imgData))f.close()It saves the image foo.png. Actually the image is empty gray thing.do you see the same?

Oleg Tarasenko 2010-02-26 05:50:44

Thanks for your help. Seems I solved the issue!

Oleg Tarasenko 2010-02-26 20:57:51

Answer 3

+4 A:

Decoded the data using the base64 codec, and then write it to the filesystem.

fh = open("imageToSave.png", "wb")
fh.write(imgData.decode('base64'))
fh.close()

Shane Holloway 2010-02-24 06:34:47

I've uploaded the image I get from your base64 string above. You can find it at: http://twitpic.com/15gzaf

Shane Holloway 2010-02-26 18:46:30

Thanks Shane, helped at last!

Oleg Tarasenko 2010-02-26 20:57:15

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