Error using imfinfo()

Every time I run this code it says that for some reason there is an error in line 142 of the function imfinfo:

filename=uigetfile('*.tif');
[r c]=size(imfinfo(filename));
for i = 1:r
    rgb = imread(filename, i);
    set(handles.textSlidenumber, 'String', i);
    status = get(radiobuttonRBG, 'Value');
    if status
        imshow(rgb);
    else 
        gray = rgb2gray(rgb);
        imshow(gray);
    end

line 142 in imfinfo is:

    error(message('MATLAB:imagesci:imfinfo:fileOpen', filename));

Answer 1

[Walter Roberson]

filename=uigetfile('*.tif');

The output you get from that call will not include any directory information. If the user chooses something that is not in the current directory, you will have difficulty.

[filename, pathname] = uigetfile('*.tif');
if ~ischar(filename)
    %user canceled
    return
end
filename = fullfile(pathname, filename);