Producers of a documentary about a former Tasmanian psychiatric hospital are defending the film, amid concerns about its content.

State Anti-Discrimination Commissioner Robin Banks wants to review the film, which uses archival footage of former patients of the Willow Court institution at New Norfolk.

She wants to ensure it does not breach the state's Anti-Discrimination Act.

One of the filmmakers, Nick Jarvis, is confident there is nothing wrong with the footage.

He believes the commissioner has been misinformed about the content.

"The images that are on there are just basically patients at the time going about their normal routines," he said.

"There is nothing in there that would show them in a degrading way and, actually, the archival footage has been approved for us to use.

"It went through somebody at Mental Health, they reviewed it and they were happy with the content as well.

"The footage that we've shown is in no way would incite any form of discrimination, I'd be quite surprised if people actually thought that after viewing it."

The documentary, which features a paranormal investigation, is yet to be released.

The Derwent Valley Council's lawyers are expected to also review the content before it its release.