MATLAB: Uiwait and warning dialog problem

Image Processing Toolboxuiwaitwarndlgwarning dialog

Hi,
I use a load image button in GUI that contains the following code:
[path, file] = uigetfile({'*.jpg;*.gif','All Image Files'},' Select image')
imgFile = strcat(path,file);
I = imread(imgFile);
imgInfo = imfinfo(imgFile);
x=imgInfo.ColorType;
while x=='grayscale'
    uiwait(warndlg('Please select a color image'));
end
I have to two problems: 1) When I click a grayscale image the warning dialog popups but I have to press the load image button in order to cancel it. I wish to click the ok causing the warning dialog to disappear. How do I do it? 2) When I exit run of the matlab code the warning dialog still appears and I cannot closed it. How to solve it?
Thanks.

Best Answer

Use this more robust code:
while true;
  [baseFileName, folder] = uigetfile({'*.jpg;*.gif;*.png;*.tif;*.bmp','All Image Files'},' Select image')
  if baseFileName == 0;
    % They canceled out.
    return;
  end
  fullFileName = fullfile(folder, baseFileName)
  [originalImage, storedColorMap] = imread(fullFileName);
  [rows, columns, numberOfColorChannels] = size(originalImage)
  if numberOfColorChannels == 3 % Will be 3 for color.
    % It's a color image.
    uiwait(warndlg('Please select a grayscale image, not a color image.')); % Will Loop again

  else
    % It's an indexed or gray image.
    if ~isempty(storedColorMap)
      % It's an indexed, not grayscale, image.
      uiwait(warndlg('Please select a grayscale image, not an indexed image.')); % Will Loop again
    else
      break; % It's color so continue on.
    end
  end
end
imshow(originalImage);
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