I am forwarding the message to octave ML because I have forgotten to send there.
> --- ajuanpi
> > > You are using qt or fltk graphics_toolkit so that gnuplot is not related to your issue.
> > >
> > > Tatsuro
> > Regardless of the toolkit I use, it seems gnuplot is doing the printing.
> > The problem is graphics_toolkit insensitive.
> AFAIK, octave printing depends on graphics_toolkit.
> On qt or fltk toolkit, octave outputs plot to a file as postpcript file and it is convered to other formatted file via ghostscript or pstoedit + fig2dev.