Tomorrow, Pixar’s Up will be not only the first animated film but also the first 3D movie to open the Cannes Film Festival. Reviews are already flowing in. I saw the movie last week, and it is spectacular. But don’t take my word for it, here is a look at the early buzz:

Screendaily: “Up has humour and action aplenty to enthrall children, but it should engage adults in equal quantities who will respond to its rich emotional content.” … “The colours of the film are ravishing and some of the compositions are painterly, while the 3D enhances the images without playing any in-your-face tricks on the audience. Michael Giacchino’s memorable music themes will be rattling around your head for hours after the film is over.”

THR: “Winsome, touching and arguably the funniest Pixar effort ever, the gorgeously rendered, high-flying adventure is a tidy 90-minute distillation of all the signature touches that came before it.” … “But what gives Up such a joyously buoyant lift is the refreshingly nongimmicky way in which the process has been incorporated into the big picture — and what a wonderful big picture it is.”

More after the jump.

Emanuel Levy: “As of May, Best Picture of the Year” … “visually inventive, emotionally compelling comedy-adventure” … “Amazingly, “Up” is by turns serious and funny, poignant and frivolous (when it needs to be), but also highly and unexpectedly romantic.”

Time: “Though it’s not yet summer, we can declare that Up, like WALL-E, will prove to be one of the most satisfying movie experiences of its year.” … “Extending the patented Pixar mix of humor and heart, Up is the studio’s most deeply emotional and affecting work.”

Variety: “Depending on what you think of “Cars,” Pixar makes it either 9½ out of 10 or 10 for 10 with “Up,” a captivating odd-couple adventure that becomes funnier and more exciting as it flies along.” … “proves disarming in its deep reserves of narrative imagination and surprise, as well as its poignant thematic balance of dreams deferred and dreams fulfilled.”

Roger Ebert: “This is a wonderful film. It tells a story. The characters are as believable as any characters can be who spend much of their time floating above the rain forests of Venezuela.” … “This is a story as tickling to the imagination as the magical animated films of my childhood, when I naively thought that because their colors were brighter, their character outlines more defined and their plots simpler, they were actually more realistic than regular films.”