getframe + frame2im + imwrite - Save figure

Question

Gennaro Arguzzi 2017-6-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/346357-getframe-frame2im-imwrite-save-figure

评论： Walter Roberson 2017-6-27

Hi everyone. I'd like to save a figure using statements getframe+frame2im+imwrite (without print statement). Is it possible to do it? I wrote the following code:

close all
clear all
t=[0:0.1:10];
x=t;
plot(t,x)
f=getframe(gcf);
[X,Map]=frame2im(f);
a=imwrite(X,'Figura 1.jpg')

but there is the error:

Error using imwrite Too many output arguments.

Error in Untitled2 (line 8) a=imwrite(X,'Figura 1.jpg')

Thank you very much.

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Answer 1

Walter Roberson 2017-6-26

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https://ww2.mathworks.cn/matlabcentral/answers/346357-getframe-frame2im-imwrite-save-figure#answer_272047

imwrite() has no outputs. It just creates the file. If for some reason you want to load the content of the file back in to compare to the data in X that you wrote out, then use imread() on the file.

Note: .jpg files will rarely compare exactly equal to the original data, because JPEG loses information as it compresses data.

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Gennaro Arguzzi 2017-6-26

Hi @Walter Roberson, maybe before I need to convert figure in frame, then I assign an index using read(frame,1) and at the end I use imwrite? The problem is how can I convert figure in frame? Thank you.