How can i Change pixel color?

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Ansam Nazar
Ansam Nazar 2020-7-7
评论： Image Analyst 2020-7-12
Hello
I have a color image of type RGB and I need to change the color of each point (red, yellow, orange) to green. I hope that there is a programmatic solution to this problem.
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jonas
jonas 2020-7-7
Better replace loop by logical indexing and upload an example image.
Mehmed Saad
Mehmed Saad 2020-7-8
jonas is right, understand the code and try to replace for loops with logical indexing

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Mehmed Saad
Mehmed Saad 2020-7-7
编辑：Mehmed Saad 2020-7-8
I = imread('red.jpg');
figure,subplot(121),imshow(I)
th = 20;
[x,y,~]=size(I);
for ii=1:x
for jj=1:y
if((I(ii,jj,1)-th)> I(ii,jj,2)&& (I(ii,jj,1)-th)>I(ii,jj,3))
I(ii,jj,1) = 0;I(ii,jj,2) = 255;I(ii,jj,3) = 0;
end
end
end
subplot(122),imshow(I)
For same effect you can try this
I(ii,jj,1:2) = circshift(I(ii,jj,1:2),1);
I(:,:,1:2) = circshift(I(:,:,1:2),1,3);%without for loop
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Ansam Nazar
Ansam Nazar 2020-7-12
Thanks alot for all of your help. but the function is not working in Matlab R2018a. the error was:
"Undefined function or variable 'imsplit'."
Image Analyst
Image Analyst 2020-7-12
You can do it manually:
r = rgbImage(:, :, 1);
g = rgbImage(:, :, 2);
b = rgbImage(:, :, 3);

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