How I can change the certain pixel values in gray scale image?

Question

TURI 2012-10-26

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https://ww2.mathworks.cn/matlabcentral/answers/51939-how-i-can-change-the-certain-pixel-values-in-gray-scale-image

评论： Mebiame 2017-7-14

%I have gray image X having values between 0 and 0 to 1, I want to change the values of certain pixel to 1 that are closer to 1 and want to change values to 0 that are near to 0. Can anyone write a code for that as I am new to matlab. Thanks

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Answer 1

Sachin Ganjare 2012-10-26

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X=imread('1.jpg')   % My image was color so was MxNxP
Xc=X(:,:,1)         % crateda  grayscale image MxN
Xc(14,20)     % here my output was ans=129
Xc(14,20)=1   % changed the value of (14,20) to 1
Xc(14,20)      % here my output was ans=1

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TURI 2012-10-26

Thanks Sachin, but how i can do this for more pixels .. e.g more that 100 pix.

Mebiame 2017-7-14

Hello,

I was wondering if there was a way to use the above but for 3D CT images (images with slices) and only change the colour of a certain pixel on that certain slice.

Thanks

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Answer 2

Image Analyst 2012-10-26

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https://ww2.mathworks.cn/matlabcentral/answers/51939-how-i-can-change-the-certain-pixel-values-in-gray-scale-image#answer_63313

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Well, you shouldn't have accepted that answer so quickly if it didn't do what you asked. Here's how to " change the values of certain pixel to 1 that are closer to 1 and want to change values to 0 that are near to 0":

yourImage = yourImage >= 0.5;