I'm trying to make a curvy header banner for a website, see here:
This is one of my several attempts. As you can see, the curve is not symmetrical.
What is a way that is guaranteed to get a perfect symmetrical curve?
Start off with a layer with "solid box"
( It helps if all the sides you don't want to turn into wavey lines, are at the edges of the document. )
Then go do
Important parts in the filter options:
You can go nuts with the other sliders.