Change colormap image processing

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Ashray Malhotra
Ashray Malhotra 2014-8-13
回答： Joseph Cheng 2014-8-13
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?

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Yu Jiang
Yu Jiang 2014-8-13
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

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Joseph Cheng
Joseph Cheng 2014-8-13
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))?

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