TORONTO -- Xavier Dolan is taking issue with Netflix for the way his acclaimed film "Mommy" has appeared on the streaming service in the United Kingdom.

The acclaimed Quebec director accused the company of tampering with his artistic vision in an open letter posted to Twitter.

Dolan says tweets alerted him to changes made to his art house hit, which employs an unusual 1:1 -- or square -- aspect ratio.

He says the format is supposed to open up temporarily for one key scene but it did not when viewed on Netflix in the U.K.

Dolan says that "shut down the emotional capacity of that scene."

A Twitter response from a Netflix account representing the U.K. and Ireland thanked Dolan for alerting them and said "we are looking into this."

Dolan says only he has the right to change visual elements of his film.

"Who has bestowed on you the right to revise my choices, and how competently have you pondered the impact of such decision both on my film and the public?" Dolan says in a letter posted Monday to his account, @XDolan.

"You can crop and tweak your own shows if you want, but don't touch my film. Take it as is, or remove it."