imwrite filename

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Diego
Diego 2011-12-29
Dear all, How can I save an image with the file name being the value of a variable?
The following code works in exporting the image but not in assigning the file name the way I need.
R is the name of the variable...
Thanks, Diego
Matlab code
imwrite(X.cdata, 'R''.png')
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Diego
Diego 2011-12-29
... this way it takes the complete filename the first time but breaks when it loops:
imwrite(X.cdata, [R{l}, '.png'])
Muhammad Ghani
Muhammad Ghani 2012-7-1
Let's say you are working in the loop, use the following for k=1:30 imwrite(filename, sprintf('name of the image to be stored_%d.png',k) ); end Hope that it helps. Ghani

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采纳的回答

Diego
Diego 2011-12-29
Thank you Fangjun and Image Analyst. Your tip Fangjun point me to the answer.
imwrite(X.cdata, [R{1}, '.png'])
Regards,
Diego

更多回答（3 个）

Fangjun Jiang
Fangjun Jiang 2011-12-29
R='MyImageFile';
imwrite(X.cdata,[R,'.png']);
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Diego
Diego 2011-12-29
Thank you Fangjun.
Yes i did that already, and it works the first time it loops, but then it breaks with a message ??? Index exceeds matrix dimensions.
Best,
Diego
Fangjun Jiang
Fangjun Jiang 2011-12-29
That means you did more loops than the number of cells you have in R. Do the following to see the exact error message.
clear R;
R={'a','b','c'};
R{4}

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Image Analyst
Image Analyst 2011-12-29
R = {'MyFileName.png'};
% Construct filename.
myFolder = 'D:\myImageFiles';
if ~exist(myFolder)
% mkdir(myFolder);
end
% Create character version of the cell.
charR = cell2mat(R);
% Create the full filename.
fullFileName = fullfile(myFolder, charR)
% Write out the image file to disk.
imwrite(imageArray, fullFileName);
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Diego
Diego 2011-12-29
Thank Image Analyst.
But this way it creates a file named 'MyFileName.png' and overwrites it over and over again.
Probably I'm doing something wrong...
Best,
Diego
Image Analyst
Image Analyst 2011-12-29
Yes. What do you mean over and over again? You never said anything about this being in a loop where you need to change the filename inside the loop. If you do, use sprintf() to construct the filename. Or see the FAQ http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F if you got the filenames into a cell array from the dir() function.

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Muhammad Ghani
Muhammad Ghani 2012-7-1
Let's say you are working in the loop, use the following
for k=1:30 imwrite(filename, sprintf('name of the image to be stored_%d.png',k) ); end
Hope that it helps.
Ghani

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