I tried this free app, DocScan, to scan a chinese book. Share following screenshots with you. It automatically detected a curled page boundary & still manually adjustable. Then, converted it to a flat page. Tried its magic shadow removal & black-and-white function. The bottom shadow was removed, but found a little flaw of graying out some text in the middle. Saved as PDF and email it out, export to iBooks, or upload to Google Docs, Evernote, Dropbox, Box.net etc. PS: the pro version has built-in functions for export files to remote storages, but in free version, you still can export files to remote storages via "Open in" other apps. Not necessary to buy the pro version.
