Unable to save image using a SAVE button

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Warid Islam
Warid Islam 2021-5-14
评论： Warid Islam 2021-5-18
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);
filePattern=handles.filePattern;
num_files=handles.num_files;
theFiles=handles.theFiles;
myFolder=handles.myFolder;
value=handles.value;
seg=handles.seg;
% 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);
end
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Walter Roberson
Walter Roberson 2021-5-15
The implication is that when you do the [filename, foldername] = uiputfile('D:\regionGrowing_MLT'); that the user is giving you a name without any file extension, and you are not appending an extension.
Your file j should be a jpeg file, considering the way you created it.

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采纳的回答

Image Analyst
Image Analyst 2021-5-15
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;
end
defaultFileName = fullfile(startingFolder, '*.jpg');
[baseFileName, folder] = uiputfile(defaultFileName, 'Specify a file');
if baseFileName == 0
% User clicked the Cancel button.
return;
end
% 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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