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

Question

Mango Feng 2020-7-7

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https://ww2.mathworks.cn/matlabcentral/answers/561098-wrong-pixel-color-when-save-figure-as-pdf-using-a-different-background-color

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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N/A 2020-7-9

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.

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Answer 1

Sai Sri Pathuri 2020-7-15

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https://ww2.mathworks.cn/matlabcentral/answers/561098-wrong-pixel-color-when-save-figure-as-pdf-using-a-different-background-color#answer_465917

编辑：Sai Sri Pathuri 2020-7-16

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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')

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Mango Feng 2020-7-19

在 MATLAB Online 中打开

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');