exportgraphics streches images whily saving if 'visible' is 'off' - bug?

조회 수: 15 (최근 30일)
Adam Zabicki
Adam Zabicki 2022년 1월 17일
답변: aamir ibrahim 2023년 8월 2일
Hello,
I stumbled upon what might be a bug, or I am just overseeing some features...
When you run this code, the two saved PDFs should be the same because they only differ in their "visible" value. But if the figure's visibility is 'off', the saved PDF is distorted: The white space at the bottom is missing, and the content is streched to the bottom end.
Is this a bug?
clear all; close all;
%% on
f1 = figure('Visible','on');
heatmap(rand(10,5))
exportgraphics(f1,'test_on.pdf','ContentType','image');
%% off
f2 = figure('Visible','off');
heatmap(rand(10,5))
exportgraphics(f2,'test_off.pdf','ContentType','image');
edit: what is odd is, that this behavior is only seen when 'ContentType' is 'image'. Saving 'vector' graphics everything is ok.
  댓글 수: 3
Adam Zabicki
Adam Zabicki 2022년 1월 24일
no, the 'drawnow' command does not change the output PDF.
Trama Robin
Trama Robin 2022년 11월 4일
I had the same issue.
In my code I have an if loop that is adding a patch on my figure only for some conditions, and the size was changing.
Adding a drawnow with an else statement and add an invisible patch even if I didn't need prevented the issue.
FYI, I am exporting in .tif, so it's an image and not a vector.

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답변 (3개)

Walter Roberson
Walter Roberson 2022년 1월 23일
Figure layout including axes layout (including xlim and ylim) is not performed until the figure visibility is turned on.
  댓글 수: 1
Adam Zabicki
Adam Zabicki 2022년 1월 24일
Hi,
thanks for your reply. May i have to add, that if you define the 'ContentType' to 'vector', both PDFs saved are identical. So it is the 'image' case only when the figure layout is not performed? Seems odd to me...

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yanqi liu
yanqi liu 2022년 1월 24일
clear all; close all;
data = rand(10,5);
%% on
f1 = figure('Visible','on');
h1=heatmap(data);
exportgraphics(f1,'test_on.pdf','ContentType','image');
fa1 = getframe(f1);
%% off
f2 = figure('Visible','off');
h2=heatmap(data);
exportgraphics(f2,'test_off.pdf','ContentType','image');
fa2 = getframe(f2);
%% compare
figure;
subplot(1,2,1); imshow(frame2im(fa1));
subplot(1,2,2); imshow(frame2im(fa2));
yes,sir,now we can see the image is same,but export pdf when visible off is different,may be the axis do not set to equal in the code
  댓글 수: 3
yanqi liu
yanqi liu 2022년 1월 24일
yes,sir,may be figure display can make the image x、y axis equal,if not display,then the x、y axis not equal,so when get pdf print,it is mismatch
Adam Zabicki
Adam Zabicki 2022년 1월 24일
But it works if 'ContentType' is set to 'vector'...

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aamir ibrahim
aamir ibrahim 2023년 8월 2일
One workaround is to set the 'WindowState' for the figure to 'minimized'.
fig = figure;
fig.WindowState = 'minimized';
fig.Visible = 'on';
% Use exportgraphics
exportgraphics(fig);
close(fig);

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