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how to black out part of an image ?

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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

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Accepted Answer

Image Analyst
Image Analyst on 17 Sep 2020
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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