How to put or replace color in rgb/greyscale picture
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Ravin Rayeok
le 29 Fév 2020
Commenté : Ravin Rayeok
le 29 Fév 2020
Hello!
Need some assistance here
Anyone knows how to put the blue color as presented in these pictures below?
Seems like the bubbles blobs (White/grey) has the same rgb value to the other non-bubble area. Black blobs are pores.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/274350/image.jpeg)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/274351/image.jpeg)
2 commentaires
Image Analyst
le 29 Fév 2020
Can you explain in words, what properties the blue regions of the gray surround have that the gray regions don't? And why do you want the blue but don't want the gray?
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Image Analyst
le 29 Fév 2020
Try this:
rgbImage = imread('image.jpeg');
subplot(2, 1, 1);
imshow(rgbImage);
% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
% Get the yellow mask
yellowMask = redChannel > 128 & greenChannel > 128;
% Get the white mask
whiteMask = redChannel > 128 & greenChannel > 128 & blueChannel > 128;
% Make yellow mask green
redChannel(yellowMask) = 0;
greenChannel(yellowMask) = 255;
blueChannel(yellowMask) = 0;
% Make the white mask blue
redChannel(whiteMask) = 0;
greenChannel(whiteMask) = 0;
blueChannel(whiteMask) = 255;
% Recombine separate color channels into a single, true color RGB image.
rgbImage2 = cat(3, redChannel, greenChannel, blueChannel);
subplot(2, 1, 2);
imshow(rgbImage2);
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/274383/image.png)
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