title: Image compression using PCA
body: <p>not sure if this is the place to ask this question.</p>
  
  <p>I have a question about PCA with regards to storage space. </p>
  
  <p>If we were to use PCA to compress images, </p>
  
  <p>We would at least have to store 
  1) The number of Principal components
  2) The numpy array where the mean was extracted</p>
  
  <p>Since the original image array size and the mean subtracted array size is the same. amount of storage required will be the same and hence where is the compression then?</p>