How to detect RGB under popup menu?

i have popup menu includes red , green and blue. When i select one of the colours, i want that choosen color will detect from a pic and will display on axes2. For example, there are 4 different shape and each one is different color. When i choose red under popupmenu, i want that which share includes red color will display on axes2. can someone help me pls?

Answer 1

[Image Analyst]

selectedItem = get(handles.popupMenu, 'Value')
if selectedItem == 1;
    % Display the red shape
elseif selectedItem == 2
    % Display the green shape
elseif selectedItem == 3
    % Display the blue shape
end

Display the shapes with whatever function you're using, for example patch() or fill(). If you're trying to do color segmentation from an RGB image, then see my color segmentation demos for ways to extract pixels of just certain colors from the image. http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

[mete polat]

actually, this is my answer but i couldn't arrange my program. i add my code, maybe you can help me a little more. Anyway thank you.