Change colormap image processing

I need a 256 intensity colormap, for which I am using the following code.

colormap(gray(256));

But when I print out the cmap using

 cmap = colormap;

I still get 64*3 double instead of a 256*3 value. What am I doing wrong?

Answer 1

[Yu Jiang]

Hi Ashray

Can you try executing the following command in MATLAB

>> set(gcf, ‘renderer’, ‘opengl’).

and see if it works?

This command changes your renderer to opengl.

If it does not work, could you let me know which release of MATLAB you are using? What is your operating system?

-Yu Jiang

Answer 2

[Joseph Cheng]

I would check to see if the figure is still open, or is the active figure. is the cmap = colormap; directly after you create the figure? if you're confident that the figure is being displayed with a 256 grayscale then why not save the cmap when you do the colormap(gray(256))?