On Fri, Oct 19, 2012 at 2:31 PM, Tony Yu <tsyu80@gmail.com> wrote:

I agree that documenting the extra filter parameter could be problematic. I guess that the decorator could inject that into the filter's docstring, but that's probably too magical. We could make it a hidden parameter and provide utility functions that just change the default behavior.

I'd prefer for the parameter to be visible and documented for each function that chooses to use it. I think we should just make application to each individual layer the default, since that's the most obvious generalization to RGB. Stéfan