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Non-linear special effect shape filters?

PostPosted: Fri Aug 20, 2021 1:56 pm
by mayo
Hello

Question: how to make this kind of nonlinear - special effect filters please?

Look at video - there is also visualization of shape of filter

https://www.youtube.com/watch?v=WfwdKU3iZyg&t=230s


Schematics are welcomed. Thanks