"As I look back to those moments, I can only have admiration and respect for all those that worked in this magnificent production. The amount of concentrated energy that goes in is quite remarkable," Big B tweeted on his blog.
A book-to-screen adaptation of F. Scott Fitzgerald's bestseller of the same name, "The Great Gatsby" features international stars Leonardo DiCaprio, Carey Mulligan and Tobey Maguire in lead roles.
Amitabh, 70, makes a brief appearance as Meyer Wolfsheim, a man with a dark past, who helps DiCaprio's character make money when he first comes to New York after the first World War.
Sharing his opinion on his co-actors, he wrote: "These huge stars of the other world, mingling and mixing and assisting one another in an effort that can only reflect well on screen, is a joy to experience.
"The effort in detail, on getting just the right shot, of seeing that each character and situation worked in accordance with a period film of the time, has been remarkable."
The movie will open the Cannes International Film Festival next month.