TASHEH (arabi —saheh kardan), islohi khatohoi matni chopie, ki dar ottiski (nuskhai) namoishi joy dorand. Agar harfho dasti chida shuda boshand, ba joi harfhoi khato harfhoi durust guzoshta meshavad va agar satrho rekhta boshand, badi isloh az nav rekhta khohand shud.
Tashehi ziyod boisi tagyiri satrho, vayronii sahifabandi megardad. Dar hurufchinii fotografi ba joi satrhoi khato dar diapozitiv (negativ) satrhoi islokhshuda meguzorand va yo diapozitiv (negativ)-ro tamoman az nav mesozand. Nigared niz Korrektura.