how to use imwrite in matlab?

This is the general format of imwrite. Its not necessary that image needs to be present in ur folder. Where A is ur image which u want to save,specify the file name and its format. For ex:

imwrite(im_DIF,'Image difference.bmp','bmp');

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mima zebouchi 2016-4-18

but what about imrwite of dicom images plz i need answer

Walter Roberson 2016-4-18

You cannot use imwrite() to write dicom images. You need dicomwrite()

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Answer 3

Alejandro Cruz Rubio 2019-6-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/224178-how-to-use-imwrite-in-matlab#answer_377441

Anyone Know how to save a block of images with imwrite?

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Alejandro Cruz Rubio 2019-6-2

在 MATLAB Online 中打开

I have a cell array whose cells contains subarrays, that is, I`ve used mat2cell function and if I use the code above I get an error message indicating "Unable to determine the file format from the file name" in imwrite function. After that, I extract the array of numbers out of the cell and I get one simple image with all the blocks. The code is:

wholeBlockR = floor(rows / blockSizeR);
blockVectorR = [blockSizeR * ones(1, wholeBlockR), rem(rows, blockSizeR)];
wholeBlockCols = floor(columns / blockSizeC); 
 blockVectorC = [blockSizeC * ones(1, wholeBlockCols), rem(columns, blockSizeC)];
arrayCells=mat2cell(Image,blockVectorR, blockVectorC); 
plotIndex=1;
 numPlotsR = size(arrayCeldas, 1);
 numPlotsC = size(arrayCeldas, 2); 
 for r = 1 : numPlotsRow
            for c = 1 : numPlotsCol
             subplot(numPlotsRow, numPlotsCol, plotIndex);
            block = arrayCells{r,c};
            imshow(block); % In this moment I show all the blocks in a simple image and each              %block is an image.
            close
            plotIndex = plotIndex + 1;
            end
    end
% In this point I need to extract each block and save it as an image.
for k=1:numel(arrayCells)
     filename = sprintf('Output_block_%d.png', K);
   imwrite(arrayCells{k}, filename); % in this point I get the error shown  % above
end

Alejandro Cruz Rubio 2019-6-3

编辑：Rik 2019-6-3

在 MATLAB Online 中打开

My version of Matlab is 2018b. Yeah I solve the problem with K and k and I get the same error. And if I use the arrayCells inside of for, that is:

for k=1:numel(arrayCells)
     filename = sprintf('Output_block_%d.png', K);
   imwrite(arrayCells{k}, filename); 
end

I get this error: "Error using imwrite (line 433)

Unable to determine the file format from the file name" because I use arrayCells but if I use "block" I don´t have any problem but I don´t get my goal

Rik 2019-6-3

在 MATLAB Online 中打开

With the code you show you actually haven't fixed the code yet. The code below should work a lot better.

for k=1:numel(arrayCells)
    filename = sprintf('Output_block_%d.png', k);%<--- lower case k, instead of upper case K
    imwrite(arrayCells{k}, filename); 
end

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Answer 4

kass 2020-1-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/224178-how-to-use-imwrite-in-matlab#answer_412715

在 MATLAB Online 中打开

for k=1:numel(I)
 imwrite(I{k}, ['filename' num2str(k) '.pgm']);
 end
%I is arraycells

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how to use imwrite in matlab?

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