Easy peasy!
This is PFM, folks. Its not like were building rockets here, but this software takes a moderately difficult task and turns it into a 1-2 minute operation at most. As others have said, youll need a really wide image thats pretty high-res for this to look good. Thats not a complaint, just think about what the software is doing!
I have one request: I am unable to resize the second monitor which is spanned from my MacBook Pro. Its very close in size in pixels, so the software draws it the same size - but the pixel density is a bit lower with a larger monitor. This causes some strangeness.
Thanks for the great work. Its a unitasker - and a good one!
Fellow Flyer about Multi Monitor Wallpaper