How Pixar Plans a Film’s Color Before Making It

A 30-second AI video ad is assembled from separate generations, and each one picks its own palette: one clip golden, the next slightly green, the third flat. Viewers rarely name the problem, but the ad feels pieced together. A brand buying AI video should ask what animation studios settled long ago: who decided the color of the whole film before the first shot was made?

Pixar’s answer is the color script, a strip of small paintings, one per scene, that maps the color and mood of an entire film before production. The idea is older than Pixar, and it fits generated video remarkably well.

A color chart for the entire production

Natalie Kalmus founded Technicolor’s Color Advisory Service in the late 1920s. From 1935 until she left the company in 1948, her name appeared as color consultant on nearly every Technicolor film, according to the George Eastman Museum’s Technicolor archive. Kalmus held that the colors of sets, costumes and furnishings had to be planned and chosen the way a painter chooses colors for a canvas.

Her method started with the script. In her 1935 paper Color Consciousness, quoted by ACMI, Kalmus described analyzing each sequence for its dominant mood, then preparing a color chart for the entire production, covering every scene, set and character. That chart, she wrote, “may be compared to a musical score.”

A video model never reads the script. Each prompt describes one moment, and the model fills in what it leaves out, palette included, from what it has learned looks plausible. On an AI project, Kalmus’s chart has to exist outside the model, written before any clip is generated, or each shot answers only to itself.

Mary Blair’s paintings, and what got lost

At Disney, color was often set by a concept artist. Mary Blair joined the studio in 1940 and worked on its projects for nearly 30 years. Disney’s D23 site credits her color and styling with shaping Cinderella, Alice in Wonderland and Peter Pan. Animator Frank Thomas recalled her as the first artist he knew to put different shades of red side by side.

Her paintings were a target, and production drifted from it. Reviewing a 2014 exhibition at the Walt Disney Family Museum, KQED’s Mirabelle Korn wrote that the tone Blair gave those films shows up less clearly on screen, and that her Peter Pan concept work glows with richer colors than any film could reproduce.

Generated video has the same gap between reference and result. Starting a clip from an approved still holds a palette far better than text alone, but as the camera moves, saturation and white balance can wander from that frame. A reference sets the target; the color grade, later, holds the clip to it.

Toy Story’s pastel strip

Color scripts were not invented by Ralph Eggleston or by Pixar, Hyperallergic notes, but Eggleston brought them to the studio when he joined in 1992 as art director of Toy Story. He planned scenes in chalk pastel on long strips of black paper, a “stream of consciousness” map of color, value and drama. Toy Story went on to earn a Special Academy Award in 1996 as the first feature-length computer-animated film. In the audio guide for MoMA’s 2005 exhibition Pixar: 20 Years of Animation, John Lasseter describes Eggleston working through the whole script and making a small drawing of each scene, focused on basic color.

What struck Lasseter was the arc. He could see “the colors got more intense when the emotions were more intense,” and grew muted when the story turned somber. One panel shows a blue dawn through a rain-streaked window, for a scene between Buzz and Woody that holds hope and sadness at once; the museum’s narrator notes that the raindrops on the pane were inspired by Richard Brooks’s film In Cold Blood. From then on, Lasseter says, every Pixar film got a color script.

This is the cheapest step to copy in an AI project. Generate a still keyframe for every shot, lay them out in order and judge them as one strip: does the color build toward the moment that matters? At this stage, a fix costs one still image.

Read like sheet music

Lou Romano spent four years as production designer on The Incredibles. In MoMA’s audio guide, he says his color script carried mostly the emotional tone of each scene, in pure abstract shapes and color, to be read “the way you might read sheet music.” He kept the panels as bare as he could, with no rendering and no lighting, so they carried the most information in pure color. When he worked on actual shots, he went back to them, so he always knew what came before and what came after.

That is the color script’s second job: continuity. In a 2011 interview, Amid Amidi, author of a book on Pixar’s color scripts, tied them to the nonlinear way computer animation is made, where a director needs every clue to what the finished image will look like. He stressed that a color script keeps evolving through the early stages of a film, alongside the story.

AI video production is even less linear: shots are generated out of order and swapped late. Drift also builds inside long clips; a December 2025 paper, Deep Forcing, notes that over extended generations “colors drift toward oversaturation.” The strip lets a reviewer judge each new clip against its neighbors while a fix still costs one generation.

A color script for a 30-second ad

Eight shots, planned, as generated, then graded to the script

Example color script for a 30-second ad

Shot	Planned	As generated	After grading
1 (0 s)	Cool, muted	Matches	Matches
2 (4 s)	Cool, darker	Warm	Regenerate
3 (8 s)	Neutral	Matches	Matches
4 (11 s)	First warm accent	Matches	Matches
5 (15 s)	Warm	Flat, cool	Matched
6 (19 s)	Warmer	Matches	Matches
7 (23 s)	Brand color at full strength	Weak brand color	Matched to the reference value
8 (27 s)	Brand color, logo	Matches	Matches

A colorist then matches every clip to its panel, shot against shot. Grading can pull a warm cast back to neutral or give a flat shot contrast. It cannot turn a golden-hour backlight into the blue morning the script calls for; that clip is regenerated, and the strip makes the call obvious.

Brand colors that must survive generation

Brand colors have to be exact, and image models handle color codes poorly. The authors of NumColor, a March 2026 paper, explain that hex codes and RGB values are split into fragments the model cannot map to a color, and cite a benchmark, GenColorBench, where accuracy on numerical color specifications stays below 15%.

A hex code in a prompt is therefore no plan. Brand-critical elements are safer as real assets, such as a filmed product or a logo, composited over the generated shot. Where generated color must carry the brand, the grade measures it on scopes against the reference value.

What to ask before generation starts

• Ask for the color script first: one still per shot, in order, on one page.
• Ask where the color peaks, and why there.
• Ask how brand colors are protected, and check the final values yourself.
• Review the graded cut as a sequence, and scrub long shots end to end for drift.

Pixar plans color for films that take years. A 30-second ad needs one page of the same thinking.