Save a group of processed imags output from a for loop in a specific folder

Hello,

I have an image database, i process them through a for loop, i want to save the output processed images in anther folder, i have the following error when i trying to do that:

Error using imwrite

unable to open file " ********.bmp" for writing. you might not have write permission

the code i have used is:

SNLImagepath='F:\SNL_images\';
FileName = fullfile(savepath, sprintf(ImageName,ext));
imwrite(a, FileName);

Answer 1

[Image Analyst]

You gave the wrong path. "savepath" is a built in function, and you're trying to call it when you call fullfile()! You should pass in SNLImagepath, not savepath. Plus you're calling sprintf() incorrectly -- you didn't give it a specification string.

Try this:

SNLImagepath='F:\Biometrics\Eman\Eman_test_SNL_Gabor\SNL_images'
FileName = fullfile(SNLImagepath, sprintf('%s%s', ImageName,ext));
 imwrite(a, FileName);

[Amelia]

Ooooh, thanks it works correctly now.

But I do not need to use the specification string with sprintf(). Matlab sees the '%' sign as a comment, plus it shows that it's enough to use two parameters to call it.

[Image Analyst]

MATLAB does NOT see the % symbol as a comment when it's embedded in a string, like I did here. You might want to learn how to use format specifier strings since it's common to all programming languages. That's the protocol where you use %, some numbers, and a letter that indicates the variable type (f, d, s, etc.).

[Amelia]

Iam sorry, i didnot notice the single comma befor and after % sign, it appears that is the reason of the error i have.

Thanks again.

Answer 2

[Ajay Kumar]

Have you correctly given the permission to the folder you are writing?

Once try this,

savepath = 'C:\Some_dir\Some_folder';
FileName = fullfile(savepath, sprintf(ImageName,ext));
imwrite(a, FileName);

[Amelia]

i already tried many forms like this, it not work too

the error still appears:

 
SNLImagepath='F:\Biometrics\Eman\Eman_test_SNL_Gabor\SNL_images'
FileName = fullfile(savepath, sprintf(ImageName,ext));
 imwrite(a, FileName);

Error using imwrite (line 467)

Unable to open file " \0001_0001.bmp" for writing. You might not have write permission.

Error in mainFile_finaltree (line 7843)

imwrite(a, FileName);

[Ajay Kumar]

you need to edit the line

FileName = fullfile(SNLImagepath, sprintf(ImageName,ext));

[Amelia]

yes, i got it.