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how to convert a grayscale image to rgb image

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KRISHNA MOORTHY
KRISHNA MOORTHY 2012-4-18
回答： DGM 2023-12-29
how to covert a grayscale image to rgb image

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回答（3 个）

Walter Roberson
Walter Roberson 2012-4-18
cat(3, YourImage, YourImage, YourImage)
The result will be a truecolor image that happens to only use gray tones.
  2 个评论
amir
amir 2012-8-22
移动：DGM 2023-12-29
Dear Walter could you please clarify the process? i didn't get how to execute the commend? many thanks
Walter Roberson
Walter Roberson 2012-8-22
移动：DGM 2023-12-29
For example:
YourImage = rgb2gray( imread('lena.tif') );
newImage = cat(3, YourImage, YourImage, YourImage);

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Image Analyst
Image Analyst 2012-8-22
This should also work:
rgbImage = ind2rgb(grayImage, gray(256));
though I usually use the cat() method given by Walter.
  1 个评论
Walter Roberson
Walter Roberson 2012-8-23
The cat() method will work when the grayscale image is class single or double, or uint8 or uint16, but ind2rgb() requires uint8 or uint16.

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DGM
DGM 2023-12-29
This answer covers multiple ways, depending on what your expected results are:
https://www.mathworks.com/matlabcentral/answers/812105-grayscale-to-rgb-in-matlab#answer_683765

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