Ramping

Ramping

You know the scenario: The action is supposed to feel timeless, but your camera is running at standard framerate. Ramping is the tool for this — a digital shutter speed manipulation that artificially slows down or speeds up motion without you having to physically shoot at 120fps or 240fps. The trick works in post or live via keyframes on the shutter speed or by interpolating frames themselves.

In classic use: You shoot normally at 24fps, and in DaVinci Resolve or in-camera itself (Sony FX30, certain RED models), you manipulate the shutter or use frame blending algorithms to calculate new frames between existing ones. The result isn't true slow motion — the motion is artificially stretched but appears more organic than pure speed ramping from repeated frames. The quality depends heavily on how well the software interpolates. Too aggressive ramping can create ghosting or artificial motion trails — this is a known artifact that you need to control.

Practical on set: Many cinematographers use ramping for dramatic moments — a punch slows down during the action, then snaps back to normal speed. This creates surreal time effects without the hassle of juggling high-speed cameras. It's also ideal for budget productions where true 240fps footage is expensive and storage-intensive. When planning, however, you should know: Ramping works better with high-contrast, well-lit action with clear motion lines. With fine detail or broad movements, the interpolation becomes visible — that's the trade-off.

A common mistake: Combining ramping with normal codec compressions. The more lossless your footage, the cleaner the interpolation. This is also why many colorists prefer ProRes or even intermediate codecs for ramping-heavy edits. Timing is crucial — a ramp over two frames feels jarring, over 15–20 frames it's usually elegant. You should also avoid working with extreme factor differences (2x slow to 0.5x fast in one second can induce nausea in the viewer). Ramping is subtle craftsmanship, not an effect.