VFX Atlas
H 090 / 3211920s

Undercranking

Undercranking / fast motion. Silent film comedy; later action and deliberate stylization

Typeface · Staatliches

Parallel Exit / Ben Model (2020): practical comparison of different recording frequencies. Temporal effect: still image or image sequence.
Parallel Exit / Ben Model (2020): practical comparison of different recording frequencies. Temporal effect: still image or image sequence.© Ben Model / Parallel Exit; comparison image by the copyright holder.View source ↗

Prompt

Apply an Undercranking treatment that suggests accelerated silent-film movement through widely spaced directional motion echoes, abrupt short blur streaks, and slightly jittered moving contours. Use high-contrast monochrome, coarse film grain, faint scratches, and mild exposure unevenness while keeping the central form readable. Keep the original subject and composition.

Paste it into LetzAI with your own image to apply the effect ↗

Identify

Movements appear accelerated and often more energetic.

Principle

Capture fewer images per second than you will play back later.

Example

Ben Model: Undercranking1 tests with parallel exit, 2020.

Try it out

Record at 12 fps2 and play it back at 24 fps.

Background

1920s silent film comedy; later action and deliberate stylization

When cranking a film camera, the frame rate controls the perceived time effect. Fewer frames per second, projected later at a higher frequency, accelerate the action. Silent film expert and researcher Ben Model demonstrates this technique with contemporary actors and smartphone footage. Unlike reverse motion, the frame sequence remains the same; unlike long interval time-lapse, the camera typically films a continuous movement.

Distinction

Not every seemingly fast-paced silent film recording was intentionally undercranked. Variable historical projection frequencies and modern transfers can alter speeds. Undercranking refers to a deliberate shooting decision.

Aftermath

Time tricks become clearer when sequence, recording frequency and playback are considered separately.

Further examples · 7 images

Ben-Hur (1925) - 6
02 Ben-Hur (1925) - 6Film crew members are positioned on a mobile camera platform next to large set pieces. The hand-cranked cameras shown were the primary tools used to achieve undercranking by manually slowing the capture rate during filming.Metro-Goldwyn-Mayer · Public domain · Wikimedia Commons
AI illustration: A police officer chases a baker with exaggerated motion blur
03 AI illustration: A police officer chases a baker with exaggerated motion blurA police officer chases a baker with exaggerated motion blur. This visualizes the fast-motion effect produced when footage recorded at a low frame rate is played back at standard speed.Illustration generated for the Atlas (AI)
AI illustration: A cameraman is shown manually operating a hand-cranked camera to capture
04 AI illustration: A cameraman is shown manually operating a hand-cranked camera to capture A cameraman is shown manually operating a hand-cranked camera to capture a stunt. By turning the crank slower than the standard rate, the resulting footage will appear accelerated during playback.Illustration generated for the Atlas (AI)
AI illustration: A filmstrip sequence displays a car performing a stunt in rapid increment
05 AI illustration: A filmstrip sequence displays a car performing a stunt in rapid incrementA filmstrip sequence displays a car performing a stunt in rapid increments. The progression of frames captures distinct stages of motion that would appear fast and energetic when projected at standard speeds.Illustration generated for the Atlas (AI)
AI illustration: A camera operator manually cranks a film camera during a sword fight
06 AI illustration: A camera operator manually cranks a film camera during a sword fightA camera operator manually cranks a film camera during a sword fight. This captures the physical act of undercranking to ensure the resulting footage appears accelerated and energetic during projection.Illustration generated for the Atlas (AI)
AI illustration: A waiter dashes through a restaurant with visible motion trails
07 AI illustration: A waiter dashes through a restaurant with visible motion trailsA waiter dashes through a restaurant with visible motion trails. This blur effectively represents the frantic, fast-motion look achieved by playing back fewer recorded frames.Illustration generated for the Atlas (AI)

Question

What happens when recording at 12 fps and playing back at 24 fps?

Show possible answer +

The action unfolds twice as fast.

Sources