Enhanced image is not getting saved as it. Values get changed after imwrite()

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Puja Bharti 2018-10-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/422212-enhanced-image-is-not-getting-saved-as-it-values-get-changed-after-imwrite

编辑： Puja Bharti 2018-10-7

My ques is: if I save the enhanced image then using imshow(NSS_Img,[]) I get the same enhanced image. But if I use imshow(NSS_Img) the image is not the saved enhanced image. Please help. Actually, I want to enhance image X and save it and then crop a small portion from the saved enhanced image. But, the values of NSS_img and the image after saving is not same. my code is given below:

    X = imread(imfile(image).name);
    filename = imfile(image).name;
    full_file = fullfile('C:\Users\Puja Bharti\Desktop\matlab\',filename);
    [pathname, name, ext] = fileparts(full_file);
    s1 = 'En';
    s2 = filename;
    s = strcat(s1,s2);
    new_name = fullfile(pathname, s)
    if size(X,3)==3
        X = rgb2gray(X);
    end
    grayImage= im2double(X);
    figure('Name','Original image'), imshow(grayImage)
    NSS_img =  NSS(grayImage);     %NSS_img is enhanced image
    whos NSS_img
    figure('Name','final image'), imshow(NSS_img,[])  
    imwrite(NSS_img,new_name,'png','Mode','lossless');