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

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Mango Feng
Mango Feng 2020-7-7
评论： Mango Feng 2020-7-19
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'.

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采纳的回答

Sai Sri Pathuri
Sai Sri Pathuri 2020-7-15
编辑：Sai Sri Pathuri 2020-7-16
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')
  1 个评论
Mango Feng
Mango Feng 2020-7-19
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');

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