Last year, the Mumbai Film Festival was abuzz about the finely restored prints of Satyajit Ray’s of the classic Apu trilogy — Pather Panchali, Apur Sansar and Aparajito. These movies, restored by the Criterion Collection, and many other such restorations of world cinema have left film buffs here wondering about the process that goes behind it, without much help.

Participants at a film identification class