CODEWITHSUNDEEP
plotoctave
Clinton Winant
Clinton Winant

Reputation: 734

plotting with black background in octave: keeping background color in print file

I am using octave (4.2.2) to make a figure with a black background.

clear;clf
%% circle
theta=linspace(0,2*pi,91);xc=cos(theta);yc=sin(theta);
fill(0.3*xc,0.3*yc,[0,0.5,0.5]);hold on
set(gca,'color',[0 0 0])

This script accomplishes that on the terminal, however if I print the figure using

print -dpng black.back.png

the image has a white background. If the set color command is changed to [1,1,1], both the figure displayed on the terminal and the printed image have a white background. Can anyone suggest a way to save an image with a black background to a file?

Upvotes: 1

Views: 3515

Answers (1)

Cris Luengo
Cris Luengo

Reputation: 60444

This is a remnant from the early days (way before Windows came around) when the display background was black by default, but paper was white as it has always been. Figures have a property called InvertHardCopy that is (still, after all these years) on by default. This property causes figures and axes to be printed with a white background.

Set it off for your expected behavior:

set(gcf,'InvertHardCopy','off')

See the MATLAB documentation. The Octave docs have a similar entry.

Upvotes: 2

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