To install an Overlay filter
Open Windows Explorer and navigate to the directory Spectaculator is installed (normally C:\Program Files (x86)\Spectaculator).
Copy the Overlay filter image (.png file) to the Overlay folder.
Restart Spectaculator.
Enable the new Overlay filter.

Note
For best results, Spectaculator should be running at least 3x zoom.
If the zoom size for the window is less than 200%, Overlay filters are automatically disabled.
Overlay filters override the TV screen scan line effect.