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[grayfox]

We would definitely need some software-writer gurus, it is open source IIRC, but don't know what language it's in...

[grayfox]

edit to add (now I see 52 has chimed in), roger on all he said, too.

I do a couple things that make it more accurate, I won't say however...

[grayfox]

2480 is a nodal sweet spot for 20", you are in the right place.
The windows default graphic viewer has a resize ability, it's calibrated in...