On Sunday 25 September 2011 13:48:01 Csikos Bela 
wrote:
> "Sebastian Krämer" <m...@kraymer.de> írta:
> >>On Fri, 2011-09-23 at 21:50 +0200, Csikos
> >>Bela wrote: Is there a pdf viewer for linux
> >>which has rulers (horizontal
> >>
> >> and  vertical)?
> >
> >I wouldn't call it a pdf viewer but Gimp can
> >open pdfs as graphics. It should have a
> >ruler. (I've never used one with gimp, so I
> >can't say for sure)
> 
> Thanks.
> Yes, pdfs can be opened in GIMP and GIMP has
> ruler. But this method has inconveniences:
> 1. The document has to be opened as one page at
> a time. 2. The screen/ruler has to be
> calibrated, and even if it is done the ruler
> gives only accurate results when the document
> is viewed at 100% magnification. If zoomed up
> or down, the valuse are not useful.
> 
> However since the dimensions of a pdf page is
> known, it would not be very difficult to draw
> a ruler in the pdf viewer, I guess. I queried
> google but could not find a viewer with
> rulers. I do not understand why it is not
> implemented in any of the viewers.
> 
> Thanks once more for your suggestion.
> 
> bcsikos

Under kde (linux) there is a kruler prg which 
produces a ruler. You can move it around, change 
orientation, scale etc
Wolfgang

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