colormap of a rgb image

Question

Anshul garg 2012-6-23

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https://ww2.mathworks.cn/matlabcentral/answers/41882-colormap-of-a-rgb-image

采纳的回答： Walter Roberson

can anyone help with getting colormap of a image?

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Answer 1

Walter Roberson 2012-6-23

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https://ww2.mathworks.cn/matlabcentral/answers/41882-colormap-of-a-rgb-image#answer_51576

The colormap of an RGB image is, by convention, [] (the empty array)

If you need to convert an RGB image to a pseudocolor image, use the two-output version of rgb2ind()

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Anshul garg 2012-6-24

i agree with you but if i want to change the gray image to same rgb image(after using rgb2gray())then i would need colormap .so where would i bring that from?

Image Analyst 2012-6-24

You can't do that. With rgb2gray, there are many colors that would give the same gray level. you'd need to do this with rgb2ind which gives you the colormap. But then if you displayed that with a gray colormap, it would look bizarre so you'd have to keep both the rgb2gray image hanging around as well as the rgb2ind image hanging around. I say why even bother with all that when you still have the original rgb image that you used to convert into gray or indexed?

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