open jpeg, png and bmp only

Question

Andi Juwandi Karmita 2017-1-9

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https://ww2.mathworks.cn/matlabcentral/answers/319552-open-jpeg-png-and-bmp-only

评论： Andi Juwandi Karmita 2017-1-10

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?

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Answer 1

Walter Roberson 2017-1-9

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https://ww2.mathworks.cn/matlabcentral/answers/319552-open-jpeg-png-and-bmp-only#answer_249837

在 MATLAB Online 中打开

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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Andi Juwandi Karmita 2017-1-10

thanks, simple n work for me.

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Answer 2

Image Analyst 2017-1-9

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https://ww2.mathworks.cn/matlabcentral/answers/319552-open-jpeg-png-and-bmp-only#answer_249829

编辑：Image Analyst 2017-1-9

在 MATLAB Online 中打开

Try

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

Better yet, just load a listbox full of the allowable images in the folder and let the user pick one. Also have a button to let them change folders. This is a nicer, kinder way to let users pick images, especially if their images are mostly all in one particular folder. See http://www.mathworks.com/matlabcentral/fileexchange/24224-magic-matlab-generic-imaging-component