Re: spurious lines in gs with antialiasing

[Ethan A M. <merritt@u.washington.edu>]

On Friday 22 July 2005 12:09 am, you wrote:
> > I have
> > gs -v
> >  ESP Ghostscript 7.07.2 (2003-11-19)
>
> I have 7.07.1 and 8.50
>
> > After running your suggested test script through the
> > current cvs version of gnuplot, I do not see the
> > artifacts you describe
> >
> > - viewing in gv works fine
>
> Try to change scaling.

I have done so. No problems.
Same for scaling in Acrobat after conversion to pdf.

> > - converting to png via ImageMagick's "convert" command
> >  works fine. (This calls gs, but I don't know the specific
> >  options it uses).
>
> Try "convert -density 23" (play with the number) and it will appear.

density less than 72 never works well. This has nothing to
do with gnuplot.  If you need to convert to a smaller image,
you should do something like "convert -density 150  -geometry 20%"
so that anti-aliasing is used.

> It depends on the output image resolution.

I believe you.  But that suggests that the undesired white lines
are 1 pixel wide, and as you reduce the resolution that "1 pixel"
becomes proportionally larger.
That does indeed sound like it could the result of fill-with-no-stroke.

-- 
Ethan A Merritt
Biomolecular Structure Center
University of Washington, Seattle 98195-7742