Hi everyone

I've just solved this problem, merely by using additional option in Acrobat Text Recognition called ClearScan (Tools->Text Recognition-> In this File->Edit-> Clear Scan)
Note: Amazon e-book
intentionally reduces quality in scanned pdfs (i.e. images of real pages) beginning from 4 gen, thus you should omit using pictures in pdf. And that acrobat tool successfully deals with.
Questions? temko97<.at/>gmail.com.