A cel, short for ''
celluloid'', is a transparent sheet on which objects are drawn or painted for
traditional, hand-drawn animation. Actual celluloid (consisting of
cellulose nitrate and
camphor) was used during the first half of the 20th century. Since it was flammable and dimensionally unstable, celluloid was largely replaced by
cellulose acetate
In biochemistry, cellulose acetate refers to any acetate ester of cellulose, usually cellulose diacetate. It was first prepared in 1865. A bioplastic, cellulose acetate is used as a film base in photography, as a component in some coatings, and ...
. With the advent of computer-assisted animation production (also known as digital ink and paint), the use of cels has been all but
obsolete in major productions.
Walt Disney Animation Studios stopped using cels in 1990, when
Computer Animation Production System (CAPS) replaced this element in their animation process.
In the next decade and a half, other animation studios phased cels out as well in favor of digital ink and paint.
Technique

Generally, the characters are drawn and painted on cels and laid over a static background painting or drawing. This reduces the number of times an image has to be redrawn and enables
studios to split up the production process to different specialised
team
A team is a group of individuals (human or non-human) working together to achieve their goal.
As defined by Professor Leigh Thompson of the Kellogg School of Management, " team is a group of people who are interdependent with respect to in ...
s. Using this
assembly line way to animate has made it possible to produce
film
A film, also known as a movie or motion picture, is a work of visual art that simulates experiences and otherwise communicates ideas, stories, perceptions, emotions, or atmosphere through the use of moving images that are generally, sinc ...
s much more cost-effectively. The invention of the
technique
Technique or techniques may refer to:
Music
* The Techniques, a Jamaican rocksteady vocal group of the 1960s
* Technique (band), a British female synth pop band in the 1990s
* ''Technique'' (album), by New Order, 1989
* ''Techniques'' (album), by ...
is generally attributed to
Earl Hurd, who patented the process in 1914.
The outline of the images are drawn on the front of the cel while colors are painted on the back to eliminate brushstrokes. Traditionally, the outlines were hand-inked, but since the 1960s they are almost exclusively
xerographed on. Another important breakthrough in cel animation was the development of the
Animation Photo Transfer Process, first seen in ''
The Black Cauldron'', released in 1985.
Typically, an animated feature would require over 100,000 hand-painted cels.
Collector's items
Production cels were sometimes sold after the animation process was completed. More popular shows and movies commanded higher prices for the cels, with some selling for thousands of dollars.
Some cels are not used for actual production work, but may be a "special" or "
limited edition" version of the artwork, sometimes even printed ("
lithographed") instead of hand-painted. These normally do not fetch as high a price as original "under-the-camera" cels, which are true
collector's items. Some unique cels have fetched record prices at art auctions. For example, a large "
pan" cel depicting numerous characters from the finale of ''
Who Framed Roger Rabbit
''Who Framed Roger Rabbit'' is a 1988 American fantasy comedy film directed by Robert Zemeckis from a screenplay written by Jeffrey Price and Peter S. Seaman. It is loosely based on the 1981 novel ''Who Censored Roger Rabbit?'' by Gary K. Wol ...
'' sold for $50,600 at
Sotheby's in 1989, including its original background.
Disney Stores sold production cels from ''
The Little Mermaid'' (their last film to use cels) at prices from $2,500 to $3,500, without the original backgrounds. Lithographed "sericels" from the same film were $250, with edition sizes of 2,500–5,000 pieces.
[''Disney Store Catalog'', June 1993]
See also
*
Cel shading, a
non-photorealistic rendering method of computer graphics to give it a feeling that it is drawn on a cel
*
Traditional animation
Traditional animation (or classical animation, cel animation, or hand-drawn animation) is an animation technique in which each frame is drawing, drawn by hand. The technique was the dominant form of animation of the 20th century, until there wa ...
: information about the process of using cels to produce animation and has a section about cels and xerography, APT, etc.
References
{{Animation
1914 introductions
History of animation
Animation technology