Why do I get an error when I am trying to write to a file using IMWRITE in MATLAB 7.8 (R2009a)?

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MathWorks Support Team
MathWorks Support Team on 1 Oct 2009
Edited: MathWorks Support Team on 8 Aug 2024
I am trying to write to a file with IMWRITE function. I am trying to create a path to a file in a folder that does not exist:
Z = peaks; surf(Z) axis tight set(gca,'nextplot','replacechildren'); surf(sin(2*pi/20)*Z,Z); F = getframe; imwrite(F.cdata,'newFolder/testfile.jpeg','jpg')
I get the following error:
ERROR: ??? Error using ==> imwrite at 409 Can't open file "newFolder/testfile.jpeg" for writing. You may not have write permission.

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Accepted Answer

MathWorks Support Team
MathWorks Support Team on 8 Aug 2024
Edited: MathWorks Support Team on 8 Aug 2024
You need to make sure that the path to file that you specify for IMWRITE exists. You can use MKDIR command to create the directory. Consider the following example:
mkdir('newFolder') imwrite(F.cdata,'newFolder/testfile.jpeg','jpg')
For more information on the MKDIR function, please refer to the documentation by executing the following in the MATLAB command prompt:
doc mkdir

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