imwrite filename

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Diego
Diego el 29 de Dic. de 2011
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')
  4 comentarios
Diego
Diego el 29 de Dic. de 2011
... 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 el 1 de Jul. de 2012
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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Respuesta aceptada

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

Más respuestas (3)

Fangjun Jiang
Fangjun Jiang el 29 de Dic. de 2011
R='MyImageFile';
imwrite(X.cdata,[R,'.png']);
  6 comentarios
Diego
Diego el 29 de Dic. de 2011
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 el 29 de Dic. de 2011
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 el 29 de Dic. de 2011
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);
  2 comentarios
Diego
Diego el 29 de Dic. de 2011
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 el 29 de Dic. de 2011
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 el 1 de Jul. de 2012
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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