Saved Matrix as Image does not give me the right pixels

Question

Hakan Östen 2020-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/535478-saved-matrix-as-image-does-not-give-me-the-right-pixels

评论： Subhadeep Koley 2020-5-28

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Hi there,

currently I am trying to save a (100 x 100) matrix in one .tif image.

When opening this image, it occurs that it has 1200 x 900 pixels eventhough it should be 100 x 100.

    
    Nsub = 100
    Q = reshape(Isub(:,:,is)(:,j),[Nsub,Nsub]); % Q has the size of 100 x 100.
    
    % Output data as a figure
    figure()
    
    %set_x_axis = [ -Nsub Nsub]; 
    %set_y_axis = set_x_axis
    imagesc(Q);
    newmap = contrast(Q); % Change into greyscale
    colormap(newmap);
    set(gca,'XTick',[], 'YTick', []);
    save_in_folder = "C:/Users/TestImages";
    file = sprintf("%s/%dmm/tif/%03d.tif", save_in_folder, List_of_foldernames(is),k);
    saveas(imagesc(Q), file);

Has anyone an idea why?

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Answer 1

Subhadeep Koley 2020-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/535478-saved-matrix-as-image-does-not-give-me-the-right-pixels#answer_440328

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Hakan, you are getting a 1200-by-900 image because you're saving the entire figure window in the tif file. If you only need to save the image, refer the code below,

nSub = 100;
% Creating a random image
img = rand(nSub);
% Visualize the image
figure
imagesc(img)
newMap = contrast(img);
colormap(newMap);
% Write the image and its associated colormap
imwrite(im2uint8(img), newMap, 'yourFile.tif')