Re: [Plplot-general] PS Driver for Image Plots

[Alan W. I. <ir...@be...>]

On 2004-11-17 10:07-0000 Andrew Ross wrote:

> On Tue, Nov 16, 2004 at 11:20:03PM -0800, Alan Irwin wrote:
>> Antialiasing must be off in
>> the postscript viewer (e.g., gv) to get good looking plots on the screen. Is
>> that the problem you refer to here? Try turning antialiasing off in the
>> postscript viewer to see whether the problem you are referring to goes away.
>
> I've observed this as a rendering issue with the viewer rather than a
> plplot problem. Reloading or refreshing the view (by pressing `a' in gv)
> usually fixes it for me. I have seen similar problems with plots from
> gnuplot and fixed them the same way. In my experience antialiasing makes
> no difference to this issue of lines across the plot.

Hmmm...  I had never heard of that "a" command before, but here is what the
gv man page states:

               A            Toggle antialiasing on and off

Sure enough, when I tried it on the example 16 postscript file result,
antialiasing (along with the artifacts) toggles on and off. So this really
is an antialiased rendering issue with this postscript viewer.

Arjen, I suggest you also consider this possibility as the source of
the artifacts you have seen on windows postscript viewers.

Alan
__________________________
Alan W. Irwin
email: ir...@be...
phone: 250-727-2902

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the Yorick front-end to PLplot (yplot.sf.net); the
Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
__________________________

Linux-powered Science
__________________________