[IPython-dev] [Notebook 1.0.0] Display two png images side by side

Francesco Montesano franz.bergesund@gmail....
Mon Sep 2 10:15:40 CDT 2013


[ps: Sent by error]

So it's complaining about trying to concatenate a string and a 'bytes'
object

Do you know if/how to solve it?

Fra


2013/9/2 Francesco Montesano <franz.bergesund@gmail.com>

> Dear Zoltan,
>
> I've split the line with the append
>
>             fig_base64 = base64.b64encode(f.read())  # this works: so file
> read and encoded without problems
>             full_html = 'data:image/png;base64,' + fig_base64   #
> error TypeError: Can't convert 'bytes' object to str implicitly
>             pngs.append(full_html)
>
>  Now if I try to print(fig_base64) before the second line I get:
>
> TypeError: Can't convert 'bytes' object to str implicitly
>
> b'iVBORw0KGgoAAAANS
>
>
>
>
>
>
> 2013/9/2 Zoltán Vörös <zvoros@gmail.com>
>
>>
>> Hi Francesco,
>>
>>
>>     import base64
>>      pngs = []
>>      for fn in images:  # loop over the input file names
>>         with open(fn, "rb") as f:
>>             pngs.append('data:image/png;base64,' +
>> base64.b64encode(f.read()))
>>
>>  But I get the following error: on the last line:
>> TypeError: Can't convert 'bytes' object to str implicitly
>>
>>  Is there a way to disable table lines in HTML?
>>
>> From this, it seems to me that you encounter the problem on the
>> png-to-base64 conversion. Is that correct? Because afterwards the image is
>> encoded in base64, so it's not binary anymore, and I don't see why html
>> should fail at that point. But if it is an error in b64encode, then you
>> probably don't have a valid input file.
>>
>> Cheers,
>> Zoltán
>>
>>
>>
>> 2013/9/2 Zoltán Vörös <zvoros@gmail.com>
>>
>>>  Hi Francesco,
>>>
>>> It might be a hack, but this works:
>>>
>>> with open("roche1.png", "rb") as image_file:
>>>     im1 = 'data:image/png;base64,' + base64.b64encode(image_file.read())
>>>
>>> with open("roche2.png", "rb") as image_file:
>>>     im2 = 'data:image/png;base64,' + base64.b64encode(image_file.read())
>>>
>>> s = """<table>
>>> <tr>
>>> <th><img src="%s"/></th>
>>> <th><img src="%s"/></th>
>>> </tr></table>"""%(im1, im2)
>>> t=HTML(s)
>>> display(t)
>>>
>>>
>>> Cheers,
>>> Zoltán
>>>
>>>
>>> On 02/09/13 15:32, Francesco Montesano wrote:
>>>
>>>  Dear List,
>>>
>>>  I have a script that produces some image and I'm creating a notebook
>>> for testing/logging.
>>>
>>>  For comparison reasons, I would like to load to images in a cell and
>>> show them side by side.
>>>
>>>  from IPython.display import Image
>>>  constr = Image(filename="fig1.png")
>>>  sigma = Image(filename="fig2.png")
>>>  display(constr, sigma)
>>>
>>>
>>>  put the figures one after the other. I've tried to play with the width
>>> keyword, but that does not help.
>>>
>>>  Making an HTML table with the output of "Image" does not work (I don't
>>> know if I should add "of course")
>>>
>>>  s = """<table>
>>> <tr>
>>> <th>{f1}</th>
>>> <th>{f2}</th>
>>> </tr>""".format(f1=constr, f2=sigma)
>>> t=HTML(s)
>>> display(t)
>>>
>>>  Is there any way to do what I want directly in the notebook? (I guess
>>> that there is some python library to do it, but I think that the notebook
>>> should be able to do it)
>>>
>>>  Cheers,
>>>
>>>  Fra
>>>
>>>
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>>
>>
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