HttpImageFilterModule: Crop with nonzero origin

[David Somers-Harris]

I'd like to use nginx's Image Filter
Module<http://wiki.nginx.org/HttpImageFilterModule>to dynamically
generate
DeepZoom<http://msdn.microsoft.com/en-us/library/cc645050%28v=vs.95%29.aspx>images.

However, I don't see an x-position or y-position argument for the crop
directive. Is it even possible for the Image Filter Module to crop quadrants
other than the top left?

David
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