MATLAB: Open jpeg, png and bmp only

bmpimage compressionjpegonly filepng

hi .. i'm making a GUI image with JPEG compression. and I want to limit the system with input image is jpeg, png and bmp only. how should I do?

Best Answer

Adapting Image Analyst's suggestion:

if ismember(ext, {'.png', '.bmp', '.jpg', '.jpeg'})
    % It's an allowed extension
else
    message = 'Only PNG, BMP, JPG, or JPEG format images are allowed.';
    uiwait(warndlg(message));
end

And remember to add .jpg and .jpeg to the uigetfile call.

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Just get all the files in the directory and keep only the ones with the extensions you want. You could even get the list of all valid image extension from imformats:

%option 1:
extensions = {'bmp', 'tif', jpg'}; %define allowed extensions yourself
%option 2:
registry = imformats; %get all image type supported by matlab
extensions = [registry.ext]; %and get their extensions
allfiles = dir(fullfile(somepath, '*.*')); 
isimage = arrayfun(@(f) ~f.isdir && any(strcmp(regexp(f.name, '\.(.*)$', 'tokens', 'once'), extensions')), allfiles);
imagefiles = allfiles(isimage);
for imagefile = imagefiles'
    Im = imread(fullfile(somepath, imagefile.name));
    ...
end

Best Answer

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