Wrong pixel color when save figure as pdf using a different background color

When I function imshow to display an image and change the default color, everything is okay. However, when I save the figure to pdf format, the color of white pixel is not correct.

set(groot, 'DefaultFigureColor', 'blue');
set(groot, 'DefaultFigureInvertHardcopy', 'off');

p = phantom();

figure(1)
imshow(p)

saveas(gcf, 'phantom.pdf');

This is the result of Figure 1.

This is the result in file 'phantom.pdf'.

[N/A]

I don't know if this helps you, but try export_fig . it served me well so far when I wanted to export things to pdf.

Answer 1

[Sai Sri Pathuri]

The cause is that renderer we use to print is switched to painters. You may use -opengl flag with print command

print(gcf, 'phantom', '-dpdf', '-opengl')

[Mango Feng]

Thanks for your answer! I found that an alternative method is changing the figure property 'Renderer' to 'opengl'.

set(groot, 'DefaultFigureColor', 'blue');
set(groot, 'DefaultFigureInvertHardcopy', 'off');
p = phantom();

figure('Renderer', 'opengl')
imshow(p)
saveas(gcf, 'phantom.pdf');