Help for setting the formatSpec

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Hong Thien Dang
Hong Thien Dang on 30 Aug 2021
Commented: Jan on 30 Aug 2021
Hi everyone,
I'm trying to read a picture file and get the size of the picture and print it to txt file. I want it like:
size img1.png
2448 3264 3
size img2.png
2458 3464 3
........
But i don't know how to do it, please help me with the code.
Here my code:
for k = 1: length(jpgFiles)
baseFileName = jpgFiles(k).name;
fullFileName = fullfile(Folder, baseFileName);
fprintf(1, 'Reading %s\n', fullFileName);
imageArray = imread(fullFileName);
E=size(imageArray);
fid=fopen('Result.txt','a');
fprintf(fid,'%.d\n',E);
fclose(fid);
Thank you very much!

Accepted Answer

Jan
Jan on 30 Aug 2021
Edited: Jan on 30 Aug 2021
fprintf(fid,'%d %d %d\n', E);
It is much faster to open the file once only:
fid = fopen('Result.txt','a');
for k = 1:length(jpgFiles)
baseFileName = jpgFiles(k).name;
fullFileName = fullfile(Folder, baseFileName);
fprintf(1, 'Reading %s\n', fullFileName);
imageArray = imread(fullFileName);
E = size(imageArray)
fprintf(fid, 'size %s\n', baseFileName); % [EDITED]
fprintf(fid, '%d %d %d\n', E);
end
fclose(fid);
  3 Comments
Jan
Jan on 30 Aug 2021
I've expanded the code in my answer.

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