Fill contour with specified color (on RGB image)?

I found the code below on matlab newsreader,, can I do it to RGB image?, if it possible to do,, can you help me how to fill contour with specified color on an RGB image??? need help,,,urgent,,,

here is the code:

fontSize = 15;

% Read in a standard MATLAB gray scale demo image.

folder = fullfile(matlabroot, '\toolbox\images\imdemos');

baseFileName = 'cameraman.tif';

fullFileName = fullfile(folder, baseFileName);

% Get the full filename, with path prepended.

fullFileName = fullfile(folder, baseFileName);

if ~exist(fullFileName, 'file')

% Didn't find it there. Check the search path for it.

fullFileName = baseFileName; % No path this time.

if ~exist(fullFileName, 'file')

% Still didn't find it. Alert user.

errorMessage = sprintf('Error: %s does not exist.', fullFileName);

uiwait(warndlg(errorMessage));

return;

end

end

grayImage = imread(fullFileName);

% Get the dimensions of the image. numberOfColorBands should be = 1.

[rows columns numberOfColorBands] = size(grayImage);

% Display the original gray scale image.

subplot(2, 2, 1);

imshow(grayImage, []);

title('Original Grayscale Image', 'FontSize', fontSize);

% Enlarge figure to full screen.

set(gcf, 'Position', get(0,'Screensize'));

set(gcf,'name','Demo by ImageAnalyst','numbertitle','off')

% Let's compute and display the histogram.

[pixelCount grayLevels] = imhist(grayImage);

subplot(2, 2, 2);

bar(pixelCount);

title('Histogram of original image', 'FontSize', fontSize);

xlim([0 grayLevels(end)]); % Scale x axis manually.

% Get a thresholded, binary image.

binaryImage = grayImage < 80;

% Display the binary image.

subplot(2, 2, 3);

imshow(binaryImage, []);

title('Binary "Mask" Image', 'FontSize', fontSize);

% Average it with the image and put into the red channel

averageImage = (256 * single(binaryImage) + single(grayImage))/2;

redChannel = grayImage; % Initialize to same as gray.

% Make it reddish just where the mask is.

redChannel(binaryImage) = averageImage(binaryImage);

% Create the RGB image.

coloredImage = cat(3, redChannel, grayImage, grayImage);

% Display the binary image.

subplot(2, 2, 4);

imshow(coloredImage, []);

title('Colored Image', 'FontSize', fontSize);