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How to have colourful contours superimposed on a grayscale (imshow) background?
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Zohreh Khazraei Manesh
on 12 May 2016
Commented: Chad Greene
on 13 May 2016
Hi! I need to create contours (with the ordinary colorbar) superimposed on a grayscale image, which I have plotted using imshow. The contours tend to appear in white. Is there any way to give them colours?
Here is my code:
Brain=load('Raw.mat');
background=mat2gray(Brain(:,:,26));
figure
imshow(background)
hold on
densities=[1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8000];
contour(volume(:,:,26),densities)
hold off
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Accepted Answer
Chad Greene
on 12 May 2016
Edited: Chad Greene
on 12 May 2016
Here's one way. If you turn the background matrix into RGB values, imshow won't try to attach the background image to the current colormap.
bg = ind2rgb(imread('cameraman.tif'),gray(256));
imshow(bg)
hold on
contour(peaks(256))
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/174293/image.png)
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