# How can i Change pixel color?

176 views (last 30 days)
Ansam Nazar on 7 Jul 2020
Commented: Image Analyst on 12 Jul 2020
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.
Mehmed Saad on 8 Jul 2020
jonas is right, understand the code and try to replace for loops with logical indexing

Mehmed Saad on 7 Jul 2020
Edited: Mehmed Saad on 8 Jul 2020
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
Image Analyst on 12 Jul 2020
You can do it manually:
r = rgbImage(:, :, 1);
g = rgbImage(:, :, 2);
b = rgbImage(:, :, 3);

### Categories

Find more on Annotations in Help Center and File Exchange

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by