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import PIL
from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
import urllib.request

with urllib.request.urlopen('http://pastebin.ca/raw/2311595') as in_file:
    hex_data = in_file.read()
print(hex_data)
img = Image.frombuffer('RGB', (320,240), hex_data) #i have tried fromstring
draw = ImageDraw.Draw(img)
font = ImageFont.truetype("arial.ttf",14)
draw.text((0, 220),"This is a test11",(255,255,0),font=font)
draw = ImageDraw.Draw(img)
img.save("a_test.jpg")

i m trying to convert binary to image,and then draw the text.but i get the error with:

img = Image.frombuffer('RGB', (320,240), hex_data) 
raise ValueError("not enough image data")
ValueError: not enough image data

i have uploaded the bytes string at here http://pastebin.ca/raw/2311595
and the picture size i can sure that is 320x240

ADDITIONAL

here is what i can sure the picture bytes string are from 320x240,just run the code will create a image from the bytes string

import urllib.request
import binascii
import struct

# Download the data.
with urllib.request.urlopen('http://pastebin.ca/raw/2311595') as in_file:
     hex_data = in_file.read()
# Unhexlify the data.
bin_data = binascii.unhexlify(hex_data)
print(bin_data)
# Remove the embedded lengths.
jpeg_data = bin_data
# Write out the JPEG.
with open('out.jpg', 'wb') as out_file:
    out_file.write(jpeg_data)

SOLVED, THIS IS THE CODE UPDATED

from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
import urllib.request
import io
import binascii

data = urllib.request.urlopen('http://pastebin.ca/raw/2311595').read()
r_data = binascii.unhexlify(data)
#r_data = "".unhexlify(chr(int(b_data[i:i+2],16)) for i in range(0, len(b_data),2))

stream = io.BytesIO(r_data)

img = Image.open(stream)
draw = ImageDraw.Draw(img)
font = ImageFont.truetype("arial.ttf",14)
draw.text((0, 220),"This is a test11",(255,255,0),font=font)
draw = ImageDraw.Draw(img)
img.save("a_test.png")
evandrix
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2 Answers2

17

That image is not formed of raw bytes - rather it is an encoded JPEG file. Moreover, you are not parsing the ascii HEX representation of the stream into proper bytes: that is, an "ff" sequence in that file is being passed to PIL as two c letters "f" instead of a byte with the number 255.

So, first, you decode the string to a proper byte sequence - sorry for the convolution - it is likely there is a better way to do that, but I am on a slow day:

data = urllib.urlopen("http://pastebin.ca/raw/2311595").read()
r_data = "".join(chr(int(data[i:i+2],16)) for i in range(0, len(data),2))

Ah, C.Y. posted on hte comment - this way:

>>> import binascii
>>> b_data = binascii.unhexlify(data)

And now, you import it to PIL as a JPEG image:

>>> from PIL import Image
>>> import cStringIO as StringIO
>>> stream = StringIO.StringIO(b_data)
>>> img = Image.open(stream)
>>> img.size
(320, 240)
jsbueno
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  • raise IOError("cannot identify image file") OSError: cannot identify image file #this is the error i get –  Feb 07 '13 at 20:22
  • C.Y.: did youdo the proper hex-decoding (in the 2 previous examples) before passing it to PIL? – jsbueno Feb 07 '13 at 20:26
  • @MarkRansom i m using python 3.3, and i have updated my code,it doesn't work –  Feb 07 '13 at 20:26
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    @C.Y go back to using `unhexlify` instead of `join` since Python 3 will interpret all those bytes as Unicode. – Mark Ransom Feb 07 '13 at 20:29
  • @C.Y I didn't check your code or any other code in the question and answer. But, are you sure you actually have a working PIL build ? There is no PIL release for Python 3, are you using some third-party port and is it guaranteed to work in exactly the same way of the official one for Python 2 (note that PIL has a very limited test suite, so passing it guarantees nearly nothing) ? – mmgp Feb 07 '13 at 20:34
  • @MarkRansom stream = io.StringIO(r_data) TypeError: initial_value must be str or None, not bytes //after i change to use unhexlify i get the error –  Feb 07 '13 at 20:34
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    @C.Y use `BytesIO` instead of `StringIO`. – Mark Ransom Feb 07 '13 at 20:38
  • @MarkRansom after i draw the text,i want to convert back bytes and store in Mysql Blob,how to convert back to bytes string? –  Feb 07 '13 at 20:47
  • @C.Y `Image.save` back into another `BytesIO` object should do it. – Mark Ransom Feb 07 '13 at 20:48
  • @MarkRansom are you missunderstanding? i want to convert img to bytes string.and store in Mysql database. –  Feb 07 '13 at 20:52
6

as other say, Python 3 better use io.BytesIO

import io
from PIL import Image

imageFileObj = open(imageFilename, "rb")
imageBinaryBytes = imageFileObj.read()
imageStream = io.BytesIO(imageBinaryBytes)
imageFile = Image.open(imageStream)
print("imageFile.size=%s" % imageFile.size)
crifan
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