1)Ability to stretch to bottom and top line of the filter independently against the middle. This will allow to soften or harden it in a much more flexible way.
2)Ability to rotate the top and bottom line of the filter independently against the middle. This way if There are is a line in the foreground and a line in the background which have different angles it will enable to adjust the filter lines according to the different lines.
I've added photos to help explain what I mean. Thanks
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