MATLAB: How to black out part of an image

digital image processinggfcImage Processing ToolboxMATLABsubplot

Hello all I have a question on how to black out part of my image. (the clown smile)
i have the code to load it all in.
But need to black out the smile of the image 
im=imread(im=imread('scaryclown.png'); % loadimage; 
im=double(rgb2gray(im));% make double and gray scale.
subplot(211); %make a subplot
imagesc(im); % show image on screen
and after the simle is black out need save it on a second subplot 
subplot (212)
imagesc(im_mod);
Thank you in advance

Best Answer

See my masking and copy and paste demos.
Also check out the Color Thresholder on the Apps tab or the tool ribbon.
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