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How to have colourful contours superimposed on a grayscale (imshow) background?

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Zohreh Khazraei Manesh
评论： Chad Greene 2016-5-13
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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采纳的回答

Chad Greene
Chad Greene 2016-5-12
编辑：Chad Greene 2016-5-12
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))

更多回答（1 个）

Zohreh Khazraei Manesh
编辑：Zohreh Khazraei Manesh 2016-5-13
Thank you for your super fast response Chad!
The solution is smart and works perfectly!

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