title: Standard Deviation of every pixel in an image in Python
body: <p>I have an image stored in a 2D array called <code>data</code>. I know how to calculate the standard deviation of the entire array using <code>numpy</code> that outputs one number quantifying how much the data is spread. However, how can I made a standard deviation map (of the same size as my image array) and each element in this array is the standard deviation of the corresponding pixel in the image array (i.e, <code>data</code>).</p>