There's no stop to awesome updates coming!

Esenthel now supports 64-bit iOS, and greatly improved image filtering algorithms.

Normally when using simple box-filter (linear filtering) when creating mip-maps, the result gets somehow blurry, and loses detail.
I've successfully attempted at trying different filtering algorithms, and ended up with following results.
Below you can see some random wallpaper images from the internet, downsampled as if they're mip mapped.
The first version is the standard linear blurry mip-map, the second version is the new algorithm for filtering mip-maps.

   
   

   
   

   
   

Additionally up-scaling filtering has been greatly improved as well, thanks to modified Lanczos Elliptic Weighted average filtering.

Here you can see an image up-scaled with standard linear filtering:
   

And here you can see brand new high quality filtering in action:
   

Noticable improvements, really neat.

Well, your algo seems to provide a better result on the edges of the elements composing the image... Congrats