With a theme as enigmatic as Amy Winehouse, it's perhaps not surprising to find disagreement among those who recall her life. Here, celebrated documentary film-maker Asif Kapadia defends his film against the Winehouse family, who have called it "misleading".

Just four years after the troubled singer-songwriter died at the age of 27, acclaimed director Asif Kapadia has brought her back into the spotlight with his latest documentary, simply entitled "Amy". It was Kapadia who previously made the acclaimed documentary "Senna" - about Formula 1 driver Ayrton Senna, another star who died young.

He reveals that, through the making of this film, he became emotionally attached to his new subject.

"I was meeting different groups of people who had never met, never spoken to each other, had an opinion of each other, and I was one of the few people that was there to connect all of the dots. So you become invested in the story and then you go home and you start talking about it and then you start dreaming about her, and that's what would happen."

"I'd start having dreams about her so she becomes a part of my life. So then you have to invest, it has to become personal, and in a way I really like her. I liked Amy, so I wanted to do right by her," said Kapadia, director of "Amy".

Kapadia interviewed many of Winehouse's friends, family and collaborators for the film, layering their words over footage of the musician from childhood onwards.

Winehouse emerges as a vibrant personality, whose soulful voice and intensely personal lyrics made her a star. But her struggles with depression, bulimia, drugs, and alcohol were worsened by the pressures of sudden fame.

Winehouse's parents appear in the film. However, they have also recently criticized it, calling it "unbalanced", and saying it suggests family members did too little to help the singer overcome her addictions.

Kapadia says he wants people to remember Winehouse for her personality, not just the tragedy of her passing.

"The more I saw of her young, the more I liked her; the more I liked her, the more I felt we owe it to her and I owe it to all of the people who don't have a voice, who've never had a story that they've told, who've never spoken out, who were there and love her, cared for her."

"And they're the people who spoke to me and they said 'this is what was going on, and this is the footage.' And because I make these films with archive, all I'm doing is showing you what went on," she said.

"Amy" is released in the UK on July 3 and in the US on July 5.