how to change specific color in image to black?

hi i am trying to make a code that change the specific user define color in image to black without changing other

can any one help me this is what i have done

% Read image
im = imread('coloredChips.png');

subplot(2,2,1);
imshow(im);
im(:,:,3)=im(:,:,2);im(:,:,2)=im(:,:,1)
subplot(2,2,2);
imshow(im);

[Rik]

How exactly did you expect this code to set any pixels to black?

What you need to do is two steps:

1. Find the locations of a particular color
2. Set those pixels to 0

You don't seem to do either just yet in your current code.

[Muhammad]

ok i want to find the loaction of red color in image ,how i can do it

[Rik]

Given that your image is probably an RGB image, what would distinguish red objects from other colors? How would you write the code to determine this for 1 pixel?

[DGM]

Related (in chronological order):

https://www.mathworks.com/matlabcentral/answers/878093-change-a-specific-color-in-an-image-to-another-one

https://www.mathworks.com/matlabcentral/answers/1706905-how-can-i-change-the-red-chips-to-black-as-the-red-and-orange-overlap-a-lot-and-the-edges-and-shadow

https://www.mathworks.com/matlabcentral/answers/1707130-how-to-change-specific-color-define-by-the-user-to-black-in-matlab

[Rik]

I think that would make this question a duplicate.

@Muhammad can you give a reason why this question should not be closed?