title: finding similar colors programmatically
body: <p>I have a buffered image in java and I want to record how similar each pixel is to another based on the color value. so the pixels with 'similar' colors will have a higher similarity value. for example red and pink will have a similarity value 1000 but red and blue will have something like 300 or less.</p>
  
  <p>how can I do this. when I get the RGB from a buffered Image pixel it returns a negative integer I am not sure how to implement this with that.</p>