Cel Animation vs Rotoscope

セル・アニメーション / ロトスコープ

Both sit in Animation Techniques, so the question is not what they belong to but how they behave. Both are read here as technique. They are reached for with some of the same intent, which is where they get confused.

Cel Animation

Cel Animation — ウィンザー・マッケイ『ルシタニア号の沈没』セル 1918 — Wikimedia Commons / Public domainCel Animation — セルへの彩色作業（CC BY-SA 3.0）Cel Animation — 『大鬧天宮』セル画 1961–64 — Wikimedia Commons / Public domain

The division-of-labor technique of painting only the moving parts on transparent celluloid layered over a still background. It defined the industrial structure of commercial animation for nearly a century.

Rotoscope

Rotoscope — フライシャーのロトスコープ特許図 1917 — Wikimedia Commons / Public domainRotoscope — ロトスコープで生まれたココ・ザ・クラウン 1924 — Wikimedia Commons / Public domainRotoscope — ソユーズムリトフィルム『七色の花』1948 の一場面 — Wikimedia Commons / Public domain

Tracing live-action footage frame by frame. Patented by the Fleischers, it mixes the gravity of live action with the freedom of drawing into a distinctive wavering line.

Cel AnimationRotoscope
Era1915–1990s1915–
FamilyAnimation TechniquesAnimation Techniques
KindTechniqueTechnique
CuesLayered transparent cels / Uniform paint / Background separated from movement / Traced ink linesMovement from live action / Wavering contours / Bodies with weight / Between film and drawing
Best used forKeeping a character stable over a long run with even paint and clear outlines · Pairing richly painted backgrounds with plainly drawn moving figuresShowing the weight of human gesture or a crowd while staying in drawing · Converting live footage into drawing for reasons of texture or rights
TypeTitles live on their own layer, never sharing a plane with the celsRedraw the lettering every frame so it wavers with the artwork
CompositionSplit moving and still elements into layers and compose each layerDo not keep the live framing, redraw the background to clean it up
MaterialPainterly backgrounds under figures filled with perfectly even colorVary the line weight and let the contour keep wavering
CautionCalling it cel shading while adding gradients and soft shadows, which muddies the area inside the outline and loses the strength of the flat plane.Tracing without deciding what a drawing should keep and what it should drop, so the movement is accurate and the image has nothing to look at.

Put these two together

Animation Techniques

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