open jpeg, png and bmp only

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?

Answer 1

[Walter Roberson]

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.

[Andi Juwandi Karmita]

thanks, simple n work for me.

Answer 2

[Image Analyst]

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

[Andi Juwandi Karmita]

TERIMA KASIH = Thank You