How to eliminate colormap?

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John Doe
John Doe 2020-6-3
编辑： John Doe 2020-6-3
a = imread('cameraman.tif') ;
image(a)
The commands are producing the image in a colormap, not in gray tone (original color). I do not want the colormap?
How to fix this without using imshow?
Thanks in advance!

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Tommy
Tommy 2020-6-3
When you supply a 2D array to image(), the values within that array are mapped to a colormap. The colormap is needed to convert scalar values to RGB triplets. imread() returns a 2D array for grayscale images, but you can supply the corresponding 3D array (where R=G=B) to image() if you want:
image(repmat(a,1,1,3))

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