MATLAB: How to conver folder (images) from GRB to Gary and save them in Output folder with the same original names

convertfaqgrayrgb

i have this code which convert image to Gray and save it in current folder.
directory = dir('AM01AFS.jpg');
for i = 1 : size(directory,1)
 filename = directory(i).name;
 img = rgb2gray(imread(filename));
 imwrite(img, ['Gr_' filename]);
end
I need to convert folder (images) from GRB to Gary and save them in Output folder with the same original names? Any help Plz.

Best Answer

You need to use fullfile() to make a name with the output folder prefixing the base file name:
outputFileName = fullfile(outputFolder, filename);
imwrite(img, outputFileName);
See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F
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