A Viewer for Windows, Cast, NotifyOnDemand, Push2Run and SetVol

If you hold down the [Alt] key while clicking on the Sharpen control, a pop-up window appears which allows you to change the sharpening matrix.

The default is:

-1 -1 -1
-1 9 -1
-1 -1 -1

However, you are welcome to set your own, for example:

0 -1 0
-1 5 -1
0 -1 0

For more information, please see here:
https://williamjchen.medium.com/the-one ... 6e81de1d59

This feature has now been greatly enhanced in version 1.4 and no longer a hidden feature- hope it will of good use to you!