[ome-users] OMERO.figure: export to PDF fails

[Kai Schleicher]

Hi Will,

thanks for you quick reply! Please find my answers in-line:

>  I just checked and there’s certainly not a limit of 18 panels on a 
> page. Exporting a PDF page with 40 panels worked OK for me.
Thanks for testing.

> Could you let me know your reportlab version?
$ pip freeze | grep reportlab
reportlab==3.4.0

we have a higher version, could that be an issue?

> Also, is this a multi-page figure?
> Are all the panels within a single page?

It is a single-page figure. I also tried dividing the panels on two 
pages, but received the same error.

> I wonder if the presence of the 19th panel would cause this bug if 
> there were only 1 or 2 of other panels there?
no, if only 1 or 2 panels are there than the 19th does not cause the 
bug. In fact it does not matter *which* panels are present or deleted, 
it just fails if its more than 18. I will sent you the images in 
question in a separate email, maybe you can reproduce the bug this way 
on your end.

> If you can reproduce this, especially with a simpler figure that would 
> be great.
I did not manage to reproduce it with other data - but I could reproduce 
it using the exact same images from the user.

> If you could send me the exported JSON “File > Export as json” that 
> fails, and one that doesn’t, that would be handy
> (either privately or remove any private names / details).
I will include the json files in the separate email together with the 
images that cause the bug.

Thanks again and cheers,
Kai

On 01/22/2018 06:04 PM, William Moore (Staff) wrote:
> Hi Kai,
>
>  I just checked and there’s certainly not a limit of 18 panels on a 
> page. Exporting a PDF page with 40 panels worked OK for me.
>
> Could you let me know your reportlab version?
> I have:
>
> $ pip freeze | grep reportlab
> reportlab==3.2.0
>
> Also, is this a multi-page figure?
> Are all the panels within a single page?
>
> I wonder if the presence of the 19th panel would cause this bug if 
> there were only 1 or 2 of other panels there?
>
> If you can reproduce this, especially with a simpler figure that would 
> be great.
>
> If you could send me the exported JSON “File > Export as json” that 
> fails, and one that doesn’t, that would be handy
> (either privately or remove any private names / details).
>
>  Cheers,
>
>   Will.
>
>
>> On 22 Jan 2018, at 16:28, Kai Schleicher <kai.schleicher at unibas.ch 
>> <mailto:kai.schleicher at unibas.ch>> wrote:
>>
>> Dear OME team,
>>
>> first of all, I wish you a happy new year and best of success for 2018!
>>
>> Coming to my question, we were contacted by a OMERO.figure user who 
>> noticed that the "export to pdf" function failed when too many images 
>> are present in the figure (A4, vertical).
>>
>> To be precises, 18 images á 512x512 pixels can still be exported, 
>> while export fails with 19 or more images of the same dimensions, see 
>> error logs below
>>
>>> Traceback (most recent call last):
>>>   File "./script", line 1875, in <module>
>>>     run_script()
>>>   File "./script", line 1861, in run_script
>>>     file_annotation = export_figure(conn, script_params)
>>>   File "./script", line 1818, in export_figure
>>>     return fig_export.build_figure()
>>>   File "./script", line 704, in build_figure
>>>     self.save_figure()
>>>   File "./script", line 1372, in save_figure
>>>     self.figure_canvas.save()
>>>   File 
>>> "/home/omeronas/omeroweb/lib/python2.7/site-packages/reportlab/pdfgen/canvas.py", 
>>> line 1237, in save
>>>     self._doc.SaveToFile(self._filename, self)
>>>   File 
>>> "/home/omeronas/omeroweb/lib/python2.7/site-packages/reportlab/pdfbase/pdfdoc.py", 
>>> line 211, in SaveToFile
>>>     raise RuntimeError("class %s instances can only be saved once" % 
>>> self.__class__.__name__)
>>> RuntimeError: class PDFDocument instances can only be saved once
>>
>> Is there maybe a limitation concerning the amount of pixels/images?
>>
>> I also attached an example Blitz0.log file when running the PDF 
>> export from the Figure file in question.
>>
>> Thank you for your help and cheers,
>> Kai
>>
>> -- 
>>>> Please note my NEW PHONE NUMBERS: +41 61 207 57 31 (direct) +41 61 
>>>> 207 22 50 (central)<<
>> Kai Schleicher, PhD | Research Associate in Advanced Light Microscopy 
>> | Biozentrum, University of Basel | Klingelbergstrasse 50/70 | 
>> CH-4056 Basel |
>> Phone: +41 61 207 57 31 (direct) +41 61 207 22 50 (central) | 
>> kai.schleicher at unibas.ch <mailto:kai.schleicher at unibas.ch> | 
>> www.biozentrum.unibas.ch <http://www.biozentrum.unibas.ch> | 
>> www.microscopynetwork.unibas.ch <http://www.microscopynetwork.unibas.ch>
>>
>> <OMERO_ExportPDF_Error_Blitz.log>_______________________________________________
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