Re: [Veusz-discuss] Export to PS/PDF without date/time information

[Jeremy Sanders]

Hi Michael

On 12/20/2015 02:48 PM, Michael Clerx wrote:


I have a bunch of figures that I export to EPS and PDF using a script.
Each time I regenerate the figures, git indicates they have changed.
Inspecting the EPS files shows the only change is a comment about the
creation date. Inspecting the PDF is more troublesome, as git treats it
as a binary file, but I'm assuming the same thing happens.

Is there any way to disable creation time information in the export so
that the figures only differ when the actual contents have changed?


The PS and PDF output is created by Qt's QPrinter code. Unfortunately it 
doesn't look like it's possible to program it to disable the creation 
date in its output.


It might be possible to delete the date in the postscript file by 
modifying it (Veusz has to do this to make the page size correct, so it 
could be stripped out). For PDF it's trickier, as you say it's a binary 
file. There are some tools available which will let you dump the decoded


There's a page here which suggests that it might be possible to add a 
filter to git to do the stripping:


http://stackoverflow.com/questions/16058187/make-git-ignore-the-date-in-pdf-files

Jeremy

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Re: [Veusz-discuss] Export to PS/PDF without date/time information

[Sherwood Botsford]

Would seem a better approach would be to add make-like capabilities to
Veusz.  That its, Veusz checks the mtime on relevant data files, and only
exports files that have changed, unless you do the equivalent of make all

Respectfully,

Sherwood of Sherwood's Forests

Sherwood Botsford
Sherwood's Forests --  http://Sherwoods-Forests.com
780-848-2548
50042 Range Rd 31
Warburg, Alberta T0C 2T0


On 21 December 2015 at 05:14, Jeremy Sanders 
wrote:

> Hi Michael
>
> On 12/20/2015 02:48 PM, Michael Clerx wrote:
>
> I have a bunch of figures that I export to EPS and PDF using a script.
>> Each time I regenerate the figures, git indicates they have changed.
>> Inspecting the EPS files shows the only change is a comment about the
>> creation date. Inspecting the PDF is more troublesome, as git treats it
>> as a binary file, but I'm assuming the same thing happens.
>>
>> Is there any way to disable creation time information in the export so
>> that the figures only differ when the actual contents have changed?
>>
>
> The PS and PDF output is created by Qt's QPrinter code. Unfortunately it
> doesn't look like it's possible to program it to disable the creation date
> in its output.
>
> It might be possible to delete the date in the postscript file by
> modifying it (Veusz has to do this to make the page size correct, so it
> could be stripped out). For PDF it's trickier, as you say it's a binary
> file. There are some tools available which will let you dump the decoded
>
> There's a page here which suggests that it might be possible to add a
> filter to git to do the stripping:
>
>
> http://stackoverflow.com/questions/16058187/make-git-ignore-the-date-in-pdf-files
>
> Jeremy
>
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> Veusz-discuss mailing list
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>
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[Veusz-discuss] Export to PS/PDF without date/time information

[Michael Clerx]

Hi,

I have a bunch of figures that I export to EPS and PDF using a script. 
Each time I regenerate the figures, git indicates they have changed. 
Inspecting the EPS files shows the only change is a comment about the 
creation date. Inspecting the PDF is more troublesome, as git treats it 
as a binary file, but I'm assuming the same thing happens.


Is there any way to disable creation time information in the export so 
that the figures only differ when the actual contents have changed?


thanks,
  Michael

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