convert grayscale to rgb

Question

evangeline 2014-1-22

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https://ww2.mathworks.cn/matlabcentral/answers/113244-convert-grayscale-to-rgb

回答： DGM 2022-4-19

I want to convert a grayscale image to rgb, but I don't want to use the gray2rgb command, I know that the input matrix is 2D, but the output image should be 3D, but I just don't know how to do it.. I dont know how to map the 2D matrix values to 3D matrix values...

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Answer 1

Walter Roberson 2014-1-22

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https://ww2.mathworks.cn/matlabcentral/answers/113244-convert-grayscale-to-rgb#answer_121770

在 MATLAB Online 中打开

rgbimage = grayimage(:,:,[1 1 1]);

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evangeline 2014-1-22

thank you so much, I just have another question, I want to check each pixel of the 2D matrix, and switch-case the value, like if its between 1 and 50 , give a specific color to it in the 3D matrix according to the that pixel value, how can I do this mapping? I want to determine the r and g and b values of the color in output matrix myself, now how can I do this with rgbimage = grayimage(:,:,[1 1 1]); ?

Walter Roberson 2014-1-22

grayslice (second form, supplying a vector of values), followed by ind2rgb() to do the conversion to an RGB image.

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Answer 2

DGM 2022-4-19

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https://ww2.mathworks.cn/matlabcentral/answers/113244-convert-grayscale-to-rgb#answer_945510

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: