getframe + frame2im + imwrite - Save figure

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.

Answer 1

[Walter Roberson]

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.

[Gennaro Arguzzi]

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.

[Walter Roberson]

imwrite(f.cdata, 'Figura 1.jpg')

Answer 2

[Image Analyst]

Why are you doing all that? If you just want to save your axes as a picture file, use saveas(), or better yet, export_fig().

https://www.mathworks.com/matlabcentral/answers/96312-how-can-i-make-my-exported-figure-appear-exactly-the-same-way-as-it-does-in-matlab-7-14-r2012a

http://blogs.mathworks.com/pick/2010/05/28/creating-and-exporting-publication-quality-graphics/

[Gennaro Arguzzi]

Hi @Image Analyst, I'm doing that because I want to learn all ways to do the same thing in MATLAB.