background color of printed figures

[Torsten Lange]

Hello!

Can I change somehow the background color when printing to png-format? I plot 
a my graphs using the loop variable (<=6) for colors. When i=6 then the symbol 
color is white, which is ok for the plots (grey background) but not for the 
png-prints where background is white.

I have to print 100s of raw figures for visual evaluation. No need for high 
quality.

GNU Octave, version 3.0.2
used print command is:
print -dpng "file.png"

Thanks, Torsten