Compressing and enhancing hand-written notes (2016)
For anyone having issues getting this to work on macOS with homebrew dependencies, I was able to get it to work after finally getting an old version of numpy installed using the following command.  sudo pip install --upgrade --ignore-installed --install-option '--install-data=/usr/local' numpy==1.9.0

If you don't use the numpy==1.9.0 you'll get the 1.14.2 version which is also broke.The rest of the options allow pip to soft-override the macOS built-in numpy 1.8.0 which is immutable in the /System/ directory.Anyway, after I did all that I was able to start playing with the app, I had previously been using a kludge workflow to get a nice output in black and white by using the imagemagick convert -shave option to remove the scanned edges of images, then doing a -depth 1 to force the depth down (which only works well on really clean scans), then I can -trim to clear the framing white pixels and re-center using the -gravity center -extent 5100x6600 to frame the contents centered inside a 600dpi image.Rough but it works, I was hassling with trying to isolate "spot colors" for another thing, but this might actually do the trick!!!