Originally Posted by Tex2002ans
I personally just work with already scanned (mostly black and white) non-fiction books. Since there are only two colors, black, and white, you can imagine that they compress quite well.
"Black and white" can be different for many people... Some refer to it this way, even though it's actually grayscale, while other refer to it this way, even though it's actually a 1 bit image (black)! 1 bit images compress better. It's the same output that you would get from processing them with Scan Tailor.