How to put or replace color in rgb/greyscale picture
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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 件のコメント
Image Analyst
2020 年 2 月 29 日
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?
採用された回答
Image Analyst
2020 年 2 月 29 日
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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