how to convert grayscale image to RGB image

hello,

Plz tell me how can i convert grayscale image to RGB image

Answer 1

[Walter Roberson]

RGBImage = cat(3, GrayImage, GrayImage, GrayImage);

would result in an RGB image with the same visual appearance as the grayscale image.

Answer 2

[Image Analyst]

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.

Answer 3

[DGM]

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.