title: Which algorithm is used by os x yosemite in SIPS -z to resize image?
body: <p>I am trying to find out which algorithm is used to resize image when I called sips -z function from the terminal mac os x yosemite.</p>
  
  <p>It seems Lanczos algorithm used in vImage framework. And it is claimed as "vImage’s geometry transforms usually look better than what you get from Quartz 2D or Core Image". Does SIPS uses Quartz 2D, Core Image, vImage or something else?</p>
  
  <p><a href="https://developer.apple.com/library/prerelease/content/documentation/Performance/Conceptual/vImage/GeometricOperations/GeometricOperations.html" rel="nofollow">https://developer.apple.com/library/prerelease/content/documentation/Performance/Conceptual/vImage/GeometricOperations/GeometricOperations.html</a></p>