Add colorbar of colored plot on grayscale image

Question

Xiaozhun Tang 2019-5-6

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https://ww2.mathworks.cn/matlabcentral/answers/460511-add-colorbar-of-colored-plot-on-grayscale-image

评论： Xiaozhun Tang 2019-5-7

I have a grayscale image and draw a colored scatter plot on it,but the colorbar just vary from blcak to white,i wanna know how to show the colorbar of the scatter plot but not grayscale image.

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Answer 1

Bjorn Gustavsson 2019-5-6

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https://ww2.mathworks.cn/matlabcentral/answers/460511-add-colorbar-of-colored-plot-on-grayscale-image#answer_373808

在 MATLAB Online 中打开

Something like this:

% Assuming your grayscale image is: d in double format
grayscaleIM(:,:,3) = (d-min(d(:)))/(max(d(:))-min(d(:)));
grayscaleIM(:,:,2) = (d-min(d(:)))/(max(d(:))-min(d(:)));
grayscaleIM(:,:,1) = (d-min(d(:)))/(max(d(:))-min(d(:)));
figure
colormap(jet)
imagesc(x,y,grayscaleIM)
hold on
scatter(X,Y,23,V,'filled')
colorbar

Perhaps you have your data in some other formats but you can easily produce an RGB-image that only shows gray-scale or a binary black-white image regardless of what colourmap you use. Then the scatter-plot will work with the current colormap, as should the colorbar.

HTH

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Xiaozhun Tang 2019-5-7

Thanks a lot for your answer! I achieve my aim by using your code. I used command 'imshow' to display the image before but without establishing RGB color-space like the first three lines of your code, so I produced a grayscale image or bingary image but not an RGB image. I ignore this before and I really appreciate your help.

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