>37 scans
>891x1280
>180 MB
Jesus fucking Christ.
Since you never heard about png compression, optimization or grayscale, and probably never will, use this:
https://www.sendspace.com/file/43dj9g
Just drop files into folder, then choose "1-16 color, rgb" for the color scans or "rgb to grayscale" for the black&white scans respectively. After program is done, get them from "Done" folder.