black and white printable graphs

[NZG]

Currently when I generate graphs I use the octave-forge print utility to 
create jpg's and then import them into PDF's

i.e.
plot(n,(ylow+yhigh),"^;;6");
title('y(n)');
xlabel('n');
ylabel('y');
print('graph5.jpg','-djpg')

I've discovered, however, that the colored lines of plot utility do not show 
up at all on my black and white printer.

I have also discovered that the Octave plot utility doesn't seem to be able to 
generate black lines.

Am I missing something?
How is this typically done?

thx,
NZG. 



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