Print Problem: Figure Background won't get printed

[aikon96]

Hey there,

I'm just trying to get a plotted Octave figure to file.
So I plotted everything -> OK, set the background of the figure to black and
wanted to print it to file.
My Octave plot looks like this:
<http://octave.1599824.n4.nabble.com/file/n4674940/pic.png> 
So by using the print command, I always get a white background of the
figure:
<http://octave.1599824.n4.nabble.com/file/n4674940/test.jpg> 


Can someone help me to get the black background at saved file?
Using ubuntu 15.10, Octave v.4.0.0

My code:





clear all
close all
clc

graphics_toolkit ('qt')

x = linspace(0,2*pi,100);


figure(1)
set(gcf,'Color',[0,0,0]) 
plot(sin(x))
hold on
rectangle('Position',[0 -1 100 2],'FaceColor','Black')
grid on
set(gca, 'YColor', [1 1 1])
set(gca, 'XColor', [1 1 1])
hold off

print('test.png')






So by using this print command I get transparent background, but how to get
a black background?
print(gcf, '-dpngalpha',test.png);






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