[NTG-context] replacing images in PDF documents

Hans Hagen pragma at wxs.nl
Sun Feb 15 13:18:27 CET 2015


On 2/15/2015 1:27 AM, Pablo Rodriguez wrote:
> Dear list,
>
> I have the following situation, that I would like to solve using ConTeXt.
>
> I have to generate a bunch of PDF documents daily, that someone else has
> to validate (put a stamp on it [let’s put it that way]).
>
> It might be a physical stamp, but it might be also a vector image.
>
> One of the issues is that the stamp has a different place in each
> document (almost).
>
> Another issue is that the stamp should be added after the document is
> generated, not before.
>
> Having the following sample:
>
>      \starttext
>      I want this image replaced:
>      \externalfigure[cow][scale=200]
>      \stoptext
>
> After generating the document (and not modifiying or recompiling the
> source), is there a way to replace the image with another one?

in principle you can append an image (xform) tit the pdf file, and then 
overload the old image object with the new content (using revision 
numbers of objects + extra xref table) but i never did that myself

Hans

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