Change a single pixel value in a Grayscale JPEG image

Question

LOKESH 2012-4-25

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/36525-change-a-single-pixel-value-in-a-grayscale-jpeg-image

I have a grayscale jpeg image X. I want to change its pixel value. For example change pixel at (14,20) to 1,How can I do it. I tried the following but it doesn't WORK:

Xc=X; %Xc is image with a pixel value changed from X[X is original image]
X(14,20); %What is the value at 14,20
Xc(14,20)=1 %Change Pixel value at 14,20 to 1

When i view its values in Variable Editor,I don't get value changed at (14,20) in Xc image.

What are the Errors or suggestion?

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Answer 1

Thomas 2012-4-25

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https://ww2.mathworks.cn/matlabcentral/answers/36525-change-a-single-pixel-value-in-a-grayscale-jpeg-image#answer_45666

在 MATLAB Online 中打开

Are you sure you are checking Xc in the variable editor, you might be checking X (original image). the above does work..

I have tried

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