How to put or replace color in rgb/greyscale picture

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Ravin Rayeok 2020-2-29

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https://ww2.mathworks.cn/matlabcentral/answers/508250-how-to-put-or-replace-color-in-rgb-greyscale-picture

评论： Ravin Rayeok 2020-2-29

采纳的回答： Image Analyst

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.

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Image Analyst 2020-2-29

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?

Ravin Rayeok 2020-2-29

Sorry my question was not clear, may be I can change the picture to simplify.

So how to change color of the picture as following, from white to blue and yellow to green?

Its a picture of different liquid phase in a pore medium.

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Answer 1

Image Analyst 2020-2-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/508250-how-to-put-or-replace-color-in-rgb-greyscale-picture#answer_417878

在 MATLAB Online 中打开

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);