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Re: Problem with PostScript output of surface plot


From: Mike Miller
Subject: Re: Problem with PostScript output of surface plot
Date: Thu, 5 May 2016 18:09:16 -0700
User-agent: Mutt/1.6.0 (2016-04-01)

On Thu, May 05, 2016 at 20:18:16 +0000, David M. Cook wrote:
> Thanks for your prompt response.  I have attached two screen copies.
> The file EPSfile.JPG is a screen copy of the display with ghostview of
> the EPS file produced by the script below including the print command;
> the file GNUPLOToutput.JPG is a screen copy of the display produced on
> the screen directly by OCTAVE (i.e., the script below without the
> print command).  The latter looks fine; the former has some shadows of
> structure that, I think, ought to be hidden. 

Ok, I see the differences in the screenshots, thanks.

I have run your commands in Octave and produced an eps file that is
essentially identical to yours. Unfortunately, I see a few different
results depending on which viewer I open the file with. Some seem to
render with some transparency so I can see layers of the surface that
are probably meant to be obscured, as your screenshot shows. And some do
not.

For the record, the evince and ghostscript viewers render without any
transparency. The GraphicsMagick viewer shows a faint transparency
similar to what your system shows. And the ImageMagick viewer renders
with even more transparency.

I get more consistent results with the gl2ps renderer, do you have a
reason for using gnuplot over the default qt toolkit?

I don't have any deeper insights into why these differences are shown in
some viewers and not others, whether some are buggy or not, or whether
the postscript generated by gnuplot is correct or not.

-- 
mike



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