Drawn on film-cel animation-painting on film

a Cel,short for celluloid,is a transparent sheet on which objects are dawn or painted for traditional,hand-draw  animation.actual celluloid was used during the first half of 20th century,but since it was flammable and dimensionally unstable it was largely replaced by cellulose acetate.with the advent of computer assisted animation production,the use of cels has been practically abandoned in major productions.Disney studios stopped using cels in 1990 when computer animation production system replaced this element in their animation process.

Generally,the characters are drawn on cals and laid over a static background drawing.this reduces of times an image has to redrawn and enables studios to slip up the the production process to different specialises teams.using the lines way to animation has made it possible to produce films much more cost-effectively.the invention technique is generally attributed to Earl Hurd, who patented process in 1914.

Techniques
There are two basic methods to produce animation directly on on film. The things he did is use blank film artist can draw.