title: Create a tailored colorbar in matlab
body: <p>I have to create a map to show how far o how close some values are from a range and give them colors in consequence. Meanwhile, values that are within that range should have another different color.<br>
  For example: only the results that are within [-2 2] can be considered valid. For the other values, colors must show how far are from these limits (-3 lighter than -5, darker)<br>
  I've tried with <em>colorbar</em>  but I'm not able to set up a self-defined color scale.<br>
  Any idea??
  Thanks in advance!</p>