Popular make-up artist Subhash Shinde says working on the upcoming biopic 'Sarbjit' is a challenging task and that he had to spend a lot of time on research.

The film is based on Sarabjit Singh, an Indian farmer who was convicted of terrorism and spying in Pakistan and was sentenced to death. He was attacked by inmates at a prison in Lahore in April 2013 and died a few days later.

"'Sarbjit' is a very challenging film for me. For 'Sarbjit', I had to spend a lot of time on research. I am quite thrilled about this project. Since, Aishwarya (Rai Bachchan) is playing Sarabjit's sister (Dalbir Kaur) in the film, her look will be de-glam... with minimum make-up," Shinde told IANS.

"We did the look test a few days back and started shooting for the film a couple of days back," added the artist, who has been a part of films like 'Grand Masti' and 'Mary Kom'.

The film is divided into a vast schedule which includes shooting here from December then moving on to filming in various cities of Punjab like Amritsar, Malerkotla and Patiala in the month of January and finally the last leg of the schedule will be shot in Delhi in the month of February.

Starring Randeep Hooda as Sarabjit Singh, the film is being directed by Omung Kumar.

It will release on May 20, 2016.