[Gnuplot-py-users] pm3d color contour output help

[Peter S. <ps...@tx...>]

Hi all,

I realize this question isn't specific to gnuplot-py, but
gnuplot-py users seem to be on the cutting edge of gnuplot
use, so I thought someone here might be able to help me.

First of all, I am running Mac OS 10.2.6, gnuplot 3.8i (from 
FINK), and the latest gnuplot-py (from CVS to get the
bug fix for temporary file deletion).

Now my problem: I would like to make color contour plots
(with pm3d for instance) to png, but I can't find palette
settings that will allow this.  The code is shown below.
When I run this code, I get:

[localhost] pstoltz% python demo.py
Error: terminal "png" does not support continous colors.

And the resulting png is drawn without pm3d.  I thought 
the 'set palette maxcolors' should fix the continuous color 
problem?  Is there some specific palette setting I *can* use to
write to png?

Any help appreciated.  And I'd like to second the motion
that a new release of gnuplot-py (with the temp file deletion 
fixed) happen as soon as time allows!

Thanks, 

Peter

===========================================
#! /usr/bin/env python

import Gnuplot
from Numeric import arange, sin, NewAxis

g=Gnuplot.Gnuplot()
x = arange(35)/2.0
y = arange(30)/10.0 - 1.5
xm = x[:,NewAxis]
ym = y[NewAxis,:]
m = (sin(xm) + 0.1*xm) - ym**2
g('set data style lines')
g('set hidden')
g('set contour base')
g('set pm3d at sb')
g('set palette maxcolors 8')
g('set term png')
g('set output "out.png"')
g.title('An example of a surface plot')
g.xlabel('x')
g.ylabel('y')
g.splot(Gnuplot.GridData(m,x,y, binary=0))