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how to convert grayscale image to RGB image

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aarti sawant
aarti sawant 2013-12-14
回答： DGM 2022-4-19
hello,
Plz tell me how can i convert grayscale image to RGB image

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回答（3 个）

Walter Roberson
Walter Roberson 2013-12-14
RGBImage = cat(3, GrayImage, GrayImage, GrayImage);
would result in an RGB image with the same visual appearance as the grayscale image.
Image Analyst
Image Analyst 2013-12-14
Another option to assign colors to certain gray levels is to create a color map that does the mapping and pass it into ind2rgb
rgbImage = ind2rgb(grayImage, jet(256)); % Choose whatever colormap you want instead of jet.
It just depends on what you want and expect the output to look like.
DGM
DGM 2022-4-19
Depending on what the goals are, there are various ways to interpret the question. The following link includes demonstrations of converting a single-channel image to a 3-channel image via:
  • channel replication (like above)
  • channel filling/deletion and potential hue adjustment
  • uniform and nonuniform colorization methods
  • color mapping
https://www.mathworks.com/matlabcentral/answers/812105-grayscale-to-rgb-in-matlab
I imagine most needs are met with replication or colormapping, but I like generalizable answers to be somewhat comprehensive.

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