Re: NR pdf is larger with current git by 15%

[Jonas Hahnfeld]

Am Samstag, den 11.07.2020, 22:28 +0900 schrieb Masamichi Hosoda:
> > Ghostscript seems to need `-sDEVICE=pdfwrite` to produce the PDF we expect.
> > 
> > Is the device specifying way on the new method (without `-sDEVICE=pdfwrite`)
> > documented by Ghostscript documents?
> > If not, it is not a bug in my humble opinion.
> 
> I've found the documented way to specify Ghostscript devices
> without `-sDEVICE=pdfwrite`.
> It is using the operator `selectdevice`.
> 
> https://www.ghostscript.com/doc/9.52/Use.htm#Output_device
> https://www.ghostscript.com/doc/9.26/Use.htm#Output_device
> 
> Here is my experiment.
> 
> ```
> $ echo "mark /OutputFile (foo.new-documented.pdf) /PageSize [595.28 841.89] 
> (pdfwrite) finddevice putdeviceprops setdevice (pdfwrite) selectdevice 
> newpath fill (foo.ps) run" > gs-command-documented.ps
> 
> $ gs -dNODISPLAY -dNOSAFER -dNOPAUSE -dBATCH -dAutoRotatePages=/None 
> -dPrinted=false gs-command-documented.ps
> ...snip...
> 
> $ qpdf --qdf foo.new-documented.pdf foo.new-documented.qdf
> 
> $ diff -u foo.old-method.qdf foo.new-documented.qdf > old-to-documented.diff
> 
> $
> ```
> 
> As a result, the drawing operators in PDF are the same as the old method.

Interesting. I had mostly looked at 
https://www.ghostscript.com/doc/Language.htm which lists setdevice, but
not selectdevice. Do you happen to know what's making the difference
here? These Ghostscript internals are funny to work with, being half-
documented and partly standardized...

Jonas

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