imwrite saving image file without extension even after specifying the extension.

2014 7 31
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更新时间：2014 7 31
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original= iin;
for hsize=3:2:9
for sigma=0.5:0.5:2
close all;
file1 =sprintf('Intern_log_plot%d_hsize=%d_sigma=%.1f',n,hsize,sigma);
file2 =sprintf('Intern_log%d_hsize=%d_sigma=%2f',n,hsize,sigma);
s1=sprintf('%s%s%s%d%s%s',image_folder,l,filenames(n).name,n,l,file1);
s2=sprintf('%s%s%s%d%s%s',image_folder,l,filenames(n).name,n,l,file2);
h=fspecial('log',hsize,sigma);
pic=imfilter(original,h);
figure;
subplot(2,2,1);
imshow(original);title('Raw Image');
subplot(2,2,2);
imshow(pic);title('Output');
colormap('default');
h=gcf;
saveas(h,s1,'jpg');
imwrite(pic,s2,'jpg');
The imwrite function writes the file to the disk as files without any extension(so the image file is not detected by image viewer softwares), with the format being already specified as 'jpg' in the imwrite function.

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 采纳的回答

Michael Haderlein
Michael Haderlein 2014-7-31

0 个投票

The file extension will not be added if you already provide a file extension in the filename. As you have dots (.) in your filename, everything after the dot will be seen as a file extension. If you add the file extension in your filename (you can add .jpg in your sprintf formats), it will work.

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YADHUKRISHNAN
YADHUKRISHNAN 2014-7-31
But the filename does not have an extension specified along with that. I can't add .jpg in sprintf because my filename is dynamic, it changes in each loop and for each images so that I have saved the filename as string
Michael Haderlein
Michael Haderlein 2014-7-31
Instead of
s1=sprintf('%s%s%s%d%s%s',image_folder,l,filenames(n).name,n,l,file1);
you just use
s1=sprintf('%s%s%s%d%s%s.jpg',image_folder,l,filenames(n).name,n,l,file1);
The same for the other filenames.
YADHUKRISHNAN
YADHUKRISHNAN 2014-7-31
I need not specify the extension in saveas and imwrite functions. Right?

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YADHUKRISHNAN
YADHUKRISHNAN 2014-7-31

0 个投票

But the filename does not have an extension specified along with that. I can't add .jpg in sprintf because my filename is dynamic, it changes in each loop and for each images so that I have saved the filename as string

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