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Re:GIMP Convolution Matrix by bitL on Sunday March 18, 2018 @01:20AM (#16610553)
A couple videos (1st one shows "real-world" meaning of both):

https://www.youtube.com/watch?v=MQm6ZP1F6ms

https://www.youtube.com/watch?v=C3EEy8adxvc

If you look at the kernel differences, for symmetric kernels they are the same, for non-symmetric they are flipped.

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