open jpeg, png and bmp only

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Andi Juwandi Karmita
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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采纳的回答

Walter Roberson
Walter Roberson 2017-1-9
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.

更多回答（1 个）

Image Analyst
Image Analyst 2017-1-9
编辑：Image Analyst 2017-1-9
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

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