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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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The description was out of date. Thanks to ineiti, I have changed the edge handling to extend the pixels instead of ignoring the weights of the pixels outside of the actual image. I have updated the description now. Sorry to have you go through all that work!
For a much better description of how the edges are handled now, see the "extend" description on wikipedia http://en.wikipedia.org/w/index.php?title=Kernel_(image_processing)#Edge_Handling
Sorry, I had adjusted the description and was asking how the changes were.
And I've added test cases to specifically catch modification to the originals.
How's that?
Good point, the description has been updated.