As a general rule, the source is not available for Core Image filters.
However, there are some exceptions where the implementation is
available online or in shader books. I'm not sure about that one
specifically. The quartz-dev list has more CI folks on it who may be
able to answer your question.
On Oct 21, 2008, at 6:13 AM, Chris Wood wrote:
Is it possible to find the built-in CI filter source somewhere? I'm
in need of an improved 'unsharp mask' filter that handles alpha
correctly for my application, and the built-in one would be a
perfect base for it.
Chris
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