On Tue, 03 Nov 1998 12:11:57 -0800, Ken <tyl### [at] pacbell net> wrote:
>
>It does seem to work better on very busy scenes as opposed to simple
>objects. The halo effect is not something I have noticed.
>
>Ken Tyler
The halo effect is because the -1s in the matrix are similar to a
sharpen filter. The simplest sharpen filter is something like
0 -1 0
-1 n -1
0 -1 0
which will change the intensity of a pixel in a way that is roughly
proportional to the gradient at that point.
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