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Re: Odd results from GhostScript

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In article <l9u*5qeUx@news.chiark.greenend.org.uk>,
   Theo <theom+news@chiark.greenend.org.uk> wrote:
> "Rob Hemmings (News)" <rhnews@dsl.pipex.com> wrote:
> > I'm using version 9.2 of GhostScript on Windows and that is producing
> > consistent results with any type of pdf file.  On RISC OS I get a
> > believable result if I use a pdf file that has been created on Windows
> > with colour in CMYK format although a little oddly the results are
> > slightly different from those produced on Windows with the same file
> > which I would have expected to be the same.
> > 
> > However, much more of a problem on RISC OS is that with a pdf file
> > that has not been created in CMYK colour it reports exactly the same
> > (incorrect) figure for each ink instead of giving the correct
> > proportions.  Running GhostScript on the same file on Windows gives a
> > correct result with the usage of each ink being different.  Can
> > anyone suggest what might be going on?
> > 

> How strange.  It appears there are two devices, 'ink_cov' and 'inkcov'
> which follow different code paths:
> https://github.com/ArtifexSoftware/ghostpdl/blob/master/devices/gdevicov.c
> Are you sure you're using the same one? Also, are you sure the DPI is
> the same (default is 75 dpi) and not getting set by some config file
> maybe?

> Otherwise I'm wondering if there's some undefined behaviour in there
> somewhere, but I can't see anything obvious...

> Theo

Hi Theo, thanks for the thoughts.  I'm definitely using ink_cov as inkcov
does not report on ink usage but on which areas of the page include an
ink (i.e. it takes no notice of density).  That confused me quite a bit
to begin with as the documentation for them is fairly thin.  

I hadn't thought about DPI but as far as I know I've done nothing to
affect that as I've just tried running exactly the same command on the
same file on both platforms, admittedly with a slightly different version
number of GhostScript.  I suppose it is possible that could affect the
first issue I've mentioned above.  However, I don't see how altering DPI
surely could not make all ink coverage values the same when they are
clearly not if you look at the document.

-- 
------------------------------------------------------------- 
 Rob Hemmings                        Southport       
 
 rhnews@dsl.pipex.com                  

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Odd results from GhostScript "Rob Hemmings (News)" <rhnews@dsl.pipex.com> - 2020-06-10 14:50 +0100
  Re: Odd results from GhostScript Theo <theom+news@chiark.greenend.org.uk> - 2020-06-10 17:57 +0100
    Re: Odd results from GhostScript "Rob Hemmings (News)" <rhnews@dsl.pipex.com> - 2020-06-10 19:04 +0100

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