[Scribus] Producing per-page diffs of PDFs?

[avox]

Brian Burger wrote:
> 
> This is more a PDF question and less a Scribus one, but this is still the
> best group I can think of to ask...
> 
> Is it possible to produce per-page diffs of two PDFs?
> 

Here's my idea:

use ghostscript to produce a png for each page:

gs -sDEVICE=pngalpha -r 150x150 -sOutputFile=oldaim-%.png oldaim.pdf
gs -sDEVICE=pngalpha -r 150x150 -sOutputFile=newaim-%.png newaim.pdf

then use Imagemagick's "composite" to calc the image-diffs:

for i in oldaim-?.png ; do
composite -compose difference $i   new${i#old}  diff${i#old}
done

then check the files diffaim-%.png visually for differences.
Identical pages should produce a white diff, otherwise the pixels where they
differ are nonwhite.

If for some reason the pages show an irrelevant systematic difference (off
by a pixel, new footer, ...)
you can try to design an ImageMagick filter which covers that.


HTH
/Andreas
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