Unable to save image using a SAVE button

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I have created a matlab GUI where I want to save the processed images using a SAVE button. I am using a slider where I can browse through the processed images. I want to save each image with the SAVE button. Unfortunately, the images are not saved in the correct format(I want to save it in the jpeg format). Any suggestions would be appreciated.
function pushbutton4_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton4 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
handles = guidata(hObject);
% dirName = fullfile(pwd,'Results',myFolder);
% if ~exist(dirName,'dir')
% mkdir(dirName);
% end
[filename, foldername] = uiputfile('D:\regionGrowing_MLT');
complete_name = fullfile(foldername, filename);
imwrite(seg{value}, complete_name,'jpg');
guidata(hObject, handles);

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Accepted Answer

Image Analyst
Image Analyst on 15 May 2021
A more robust way is this:
% Get the name of the file that the user wants to save.
% Note, if you're saving an image you can use imsave() instead of uiputfile().
startingFolder = 'D:\regionGrowing_MLT'; % Or "pwd" or wherever you want.
if ~isfolder(startingFolder)
startingFolder = pwd;
defaultFileName = fullfile(startingFolder, '*.jpg');
[baseFileName, folder] = uiputfile(defaultFileName, 'Specify a file');
if baseFileName == 0
% User clicked the Cancel button.
% If they entered an extension, throw it away because (for some reason)
% we want to force it to be JPG format, not whatever other format they may have entered.
[~, baseFileNameNoExt, ext] = fileparts(baseFileName)
fullFileName = fullfile(folder, [baseFileNameNoExt, '.jpg'])
% Now save the JPG image.
imwrite(seg{value}, fullFileName);
Of course you're better off using PNG format than the lossy JPG which often shows bad compression artifacts.

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