if numberOfColorChannels > 1
% It's not really gray scale like we expected - it's color.
% Convert it to gray scale by taking only the green channel.
grayCoverImage = grayCoverImage(:, :, 2); % Take green channel.
elseif ~isempty(storedColorMap)
% There's a colormap, so it's an indexed image, not a grayscale image.
% Apply the color map to turn it into an RGB image.
grayCoverImage = ind2rgb(grayCoverImage, storedColorMap);
% Now turn it into a gray scale image.
grayCoverImage = uint8(255 * mat2gray(rgb2gray(grayCoverImage)));
end
[rows, columns, numberOfColorChannels] = size(grayCoverImage); % Update. Only would possibly change, and that's if the original image was RGB or indexed.
% Display the image.
hFig = figure;
subplot(1, 2, 1);
imshow(grayCoverImage, []);
axis on;
caption = sprintf('The Original Grayscale Image\nThe "Cover" Image.');
title(caption, 'FontSize', fontSize, 'Interpreter', 'None');
% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');
% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')
%===============================================================================
% Get the string the user wants to hide:
hiddenString = 'This is your sample hidden string.';
% Ask user for a string.
defaultValue = hiddenString;
titleBar = 'Enter the string you want to hide';
userPrompt = 'Enter the string you want to hide';
caUserInput = inputdlg(userPrompt, titleBar, [1, length(userPrompt) + 75], {num2str(defaultValue)});
if isempty(caUserInput)
% Bail out if they clicked Cancel.
if numberOfColorChannels > 1
% It's not really gray scale like we expected - it's color.
% Convert it to gray scale by taking only the green channel.
grayCoverImage = grayCoverImage(:, :, 2); % Take green channel.
elseif ~isempty(storedColorMap)
% There's a colormap, so it's an indexed image, not a grayscale image.
% Apply the color map to turn it into an RGB image.
[rows, columns, numberOfColorChannels] = size(grayCoverImage); % Update. Only would possibly change, and that's if the original image was RGB or indexed.
% Display the image.
hFig = figure;
subplot(1, 2, 1);
imshow(grayCoverImage, []);
axis on;
caption = sprintf('The Original Grayscale Image\nThe "Cover" Image.');
