title: ImageJ - compare original and resized image on similarity
body: <p>Dear Colleagues.
  Could you help me please with next question.
  I want to resize huge amount of images and substitute original images with resized for saving disk space. But before substitution I want to be sure, that resized image is the same original image but with different dimensions (not white list, not Malevich's square and so on). 
  Is there a way to check such similarity to be sure that resizing was successful?
  Thanks.   </p>