How to set background as black without appearing in colorbar?

Hi, I have an image and the pixel values range from 0 to 180, represented by jet colorbar range.

However, I would like to differentiate my object in the image with its background by setting the background pixels out of the [0 180] range, such as 500, and make the pixels which have 500 value to be black.

But I do not want it to appear as part of the color bar. How can I go about doing that ??

Any form of help is much appreciated and happy holiday! :)

Answer 1

[Doug Hull]

Axes have color. You could set the color of the axes. Then you can put NaN in the image on any pixel you want to be 'empty'.

[Shing]

Hi,

I tried setting NaN into my image matrice. But how do I go about setting it as black background without it appearing within color bar?

Answer 2

[Sean de Wolski]

Set the 'YLim' property of the colorbar to be the range you want:

surf(peaks);
h = colorbar;
set(h,'YLim',[2 5]);