How to eliminate colormap?

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!

Answer 1

[Tommy]

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))