Traditional animation

Traditional animation (or classical animation, cel animation, or hand-drawn animation) is an animation technique in which each frame is drawn by hand. The technique was the dominant form of animation in the United States until there was a shift to computer animation in the industry, such as 3D computer animation. Despite this, the process remains commonly used primarily in the form of digital ink and paint for television and film, especially when outsourced.

Animation production usually begins after a story is converted into an animation film script, from which a storyboard is derived. A storyboard has an appearance somewhat similar to comic book panels, and is a shot by shot breakdown of the staging, acting and any camera moves that will be present in the film. The images allow the animation team to plan the flow of the plot and the composition of the imagery. Storyboard artists will have regular meetings with the director and may redraw or "re-board" a sequence many times before it meets final approval.

Before animation begins, a preliminary soundtrack or scratch track is recorded so that the animation may be more precisely synchronized to the soundtrack. Given the slow manner in which traditional animation is produced, it is almost always easier to synchronize animation to a preexisting soundtrack than it is to synchronize a soundtrack to pre-existing animation. A completed cartoon soundtrack will feature music, sound effects, and dialogue performed by voice actors. The scratch track used during animation typically contains only the voices, any songs to which characters must sing-along, and temporary musical score tracks; the final score and sound effects are added during post-production.

In the case of Japanese animation and most pre-1930 sound animated cartoons, the sound was post-synched; the soundtrack was recorded after the film elements were finished by watching the film and performing the dialogue, music, and sound effects required. Some studios, most notably Fleischer Studios, continued to post-synch their cartoons through most of the 1930s, which allowed for the presence of the "muttered ad-libs" present in many Popeye the Sailor and Betty Boop cartoons.

When storyboards are sent to the design departments, character designers prepare model sheets for any characters and props that appear in the film; and these are used to help standardize appearance, poses, and gestures. The model sheets will often include "turnarounds" which show how a character or object looks in three-dimensions along with standardized special poses and expressions so that the artists have a guide to refer to. Small statues known as maquettes may be produced so that an animator can see what a character looks like in three dimensions. Background stylists will do similar work for any settings and locations present in the storyboard, and the art directors and color stylists will determine the art style and color schemes to be used.

A timing director (who in many cases will be the main director) will take the animatic and analyze exactly what poses, drawings, and lip movements will be needed on what frames. An exposure sheet (or X-sheet) is created; this is a printed table that breaks down the action, dialogue, and sound frame-by-frame as a guide for the animators. If a film is based more strongly in music, a bar sheet may be prepared in addition to or instead of an X-sheet. Bar sheets show the relationship between the on-screen action, the dialogue, and the actual musical notation used in the score.

Layout begins after the designs are completed and approved by the director. It is here that the background layout artists determine the camera angles, camera paths, lighting, and shading of the scene. Character layout artists will determine the major poses for the characters in the scene and will make a drawing to indicate each pose. For short films, character layouts are often the responsibility of the director. The layout drawings and storyboards are then spliced, along with the audio and an animatic is formed (not to be confused with its predecessor, the leica reel).

While the animation is being done, the background artists will paint the sets over which the action of each animated sequence will take place. These backgrounds are generally done in gouache or acrylic paint, although some animated productions have used backgrounds done in watercolor or oil paint. Background artists follow very closely the work of the background layout artists and color stylists (which is usually compiled into a workbook for their use) so that the resulting backgrounds are harmonious in tone with the character designs.