We have looked at a few variations on the backend decorator theme, one uses the keyword argument style while another uses import techniques (with no resulting overhead). The importing style proved to be a bit unpythonic though, so we are going with a more explicit backend manager.
How we will handle documentation of a function and its backend is also a topic of discussion. The backend function documentation should be made available if that backend is in use, or at least a good indication that this backend is the one at service.
I also started with some color conversion backends, and I've found that implementations differ to some extent. HSV for example is handled quite arbitrarily between frameworks and this will hamper comparative testing. Even gray scale conversion offers subtle differences.
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