But "despite everyone's best efforts, we were unable to convert the film in its entirety and meet the highest standards of quality," the studio said in a statement about the latest big-screen installment of J.K. Rowling's saga.
"We do not want to disappoint fans who have long anticipated the conclusion of this extraordinary journey, and to that end, we are releasing our film day-and-date on November 19, 2010, as planned.
"We, in alignment with our filmmakers, believe this is the best course to take in order to ensure that our audiences enjoy the consummate 'Harry Potter' experience," Warner added.
The final chapter of the Harry Potter saga will be released in two parts: "Harry Potter and the Deathly Hallows Part 1" in November, followed by Part 2 which is scheduled for release next July, in both 2D and 3D formats.
Plans to convert 2D films to 3D -- as opposed to made from scratch in 3D -- have come under heavy criticism in Hollywood after the 3D release of "Clash of the Titans" was a major flop.
The new film about the boy wizard will be the seventh -- after "Harry Potter and the Philosopher's Stone" in 2001, "Harry Potter and the Chamber of Secrets" in 2002, "Harry Potter and the Prisoner of Azkaban" in 2004, "Harry Potter and the Goblet of Fire" in 2005, "Harry Potter and the Order of the Phoenix" in 2007, and 2009's "Harry Potter and the Half-Blood Prince."
After Friday's announcement, producer David Heyman said the studio's "priority has always been to preserve the integrity of Jo Rowling’s books as we have adapted them to the screen, and this decision reflects that commitment."
Last week the industry press reported that James Cameron's blockbuster "Titanic," the second-biggest earner in film history, will be released in 3D in 2012. Cameron's "Avatar" was seen as a breakthrough for 3D last year.
Next year will also see a 3D re-release of "Star Wars," The Hollywood Reporter said.
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