Resolve FX · Blur · 07
Radial Blur creates rotational softening around a chosen centre point. It is useful when the image needs circular motion energy, spinning transitions or an intentional stylised sweep that cannot be described by a single straight blur direction.
This guide follows the real Resolve 21 panel: Smooth Strength, Blur Type, Blur Symmetry, Channel Adjustment, Center Position, Quality, Border Type, Move With Sizing, Blur Alpha and Global Blend.
Controls
The effect becomes readable only when these three things work together: how strong the blur is, where the centre sits, and how the frame edges are handled. Quality and Blend then determine whether it feels rough, clean or deliberately stylised.
Radial Blur is defined by blur amount, processing style and rotational direction. Smooth Strength controls intensity, Blur Type changes the feel between Stylized and Realistic, and Blur Symmetry decides whether the blur is symmetric or biased clockwise or anticlockwise.
Per-channel Red, Green, Blue and Alpha controls let you scale each channel independently. Center Position sets the X/Y point around which the radial blur is calculated. This centre placement is often the biggest factor in whether the effect feels natural or deliberately graphic.
Quality sets the processing mode between Faster, Better and Enhanced. Border Type defines how the edges behave: Black, Replicate, Reflect or Wrap-Around. Move With Sizing helps the blur track sizing operations correctly, and Blur Alpha matters when transparency should be part of the effect.
Global Blend reduces or restores the configured Radial Blur without rebuilding the other settings. It is a practical finishing control when the blur structure is right but the overall intensity is still too strong for the shot.
Blur behaviour
Realistic tends to feel more natural, Stylized looks more graphic, and Blur Symmetry decides whether the blur spreads evenly or drifts in one direction. These are the controls that make Radial Blur either subtle motion energy or a clear visual effect.
Spreads the blur evenly around the centre and usually feels the most balanced.
Biases the blur in the clockwise direction and adds a sense of rotational push.
Mirrors that bias in the opposite direction and is useful when motion should unwind the other way.
Practical use
Animate Smooth Strength or Blend for stylised transitions that feel like a rotational sweep rather than a simple directional smear.
A carefully placed centre can make lights, graphics or UI elements feel energized without blurring the whole frame in one flat direction.
Stylized mode and asymmetric blur work well on titles, logos and design elements when the goal is graphic movement rather than optical realism.
Use a dedicated node with a window or key when only a selected region should receive the rotational blur and the rest of the shot must remain stable.
Typical mistakes
If the blur centre does not belong to the composition, the motion can look arbitrary. Small X/Y changes often make a large difference.
Radial Blur can expose the frame edges quickly. Replicate, Reflect and Wrap-Around all behave differently, so the edge strategy should be chosen deliberately.
Heavy rotational blur destroys structure fast. What feels exciting in isolation can become unreadable once the shot must still communicate information.
If the movement in the shot is clearly linear, Directional Blur is usually the cleaner choice. Radial Blur works best when the motion should wrap or orbit around a point.
Radial Blur vs Directional Blur
Choose it when motion should wrap around a point, feel circular or behave like a spin around a center.
Choose it when the blur must follow one clear line, angle or linear motion path.
Radial Blur creates the impression of rotation around a chosen centre. The key control is not only Strength but the centre itself, because it defines the compositional meaning of the effect.
| Control / layer | Meaning | Inspection point |
|---|---|---|
| Center Position | Defines the axis/centre of rotation. | Place it on the real object axis or a deliberate compositional anchor. |
| Smooth Strength | Amount/smoothness of rotational smear. | Inspect straight lines near the perimeter where errors are most visible. |
| Blur Symmetry | Balance of smear around the source position. | Compare leading/trailing arcs with motion direction. |
| Channels / Blend | Per-channel stylisation and overall amount. | Keep RGB matched for neutral motion. |
Likely cause: Center Position is unrelated to subject/camera motion.
Fix: Tie the centre to a real axis or deliberate design anchor.
Likely cause: Strength is too high for the frame radius.
Fix: Reduce Strength or limit the effect with a mask.
Likely cause: Center Position is static while the anchor moves.
Fix: Animate/track the centre.
Strong full-frame rotational blur can be expensive. Use the minimum sufficient strength and cache long 4K/8K sections when needed.
Center Position and Strength are particularly useful to keyframe. For a spin transition, sync the Strength curve with actual rotational speed/edit rhythm rather than simply turning the FX on for a few frames.
For a stylised transition, keep Radial Blur on a dedicated node/clip after the base grade. Final grain and light sharpening usually make more sense after the rotational smear.
rectangular local averaging shaped by Iterations
simple controllable blur with H/V and channel shaping
smoothly weighted blur without a directional vector
natural softness, defocus beds and clean-up
linear vector driven by Angle
motion smears and horizontal/diagonal streaks
aperture and bokeh profile
optical defocus character without depth analysis
discrete cells and pixelation
detail concealment and graphic stylisation
rays toward or away from a centre
rush, punch-in/out and depth-like transitions
depth-aware virtual lens
different defocus across foreground, subject and background
Where to place FX and preserve operation order.
How to localise blur and keep the matte tracked over time.
Coordinates, crop/zoom and FX-centre behaviour after transforms.
Check RGB contamination, clipping and technical side effects.
Control names and panel layout are also cross-checked against the real DaVinci Resolve 21 screenshots shown earlier on this page. Where Blackmagic does not publish implementation math, this guide describes observable behaviour and does not invent a proprietary kernel.
FAQ
Radial Blur creates rotational blur around a chosen centre point. You can control intensity, processing style, symmetry, channel behaviour, centre position, edge handling and final blend.
Stylized gives a more graphic and explicit effect, while Realistic tends to feel cleaner and closer to natural motion energy.
Blur Symmetry chooses whether the blur spreads evenly in both directions or is biased Clockwise or Anticlockwise. This changes the sense of motion significantly.
Use Center Position X and Y. Moving the centre changes the rotational axis and often makes the difference between a messy effect and a well-composed one.
Choose Radial Blur when the motion should feel circular, spinning or orbiting around a point. Use Directional Blur when the motion should follow one clear line or angle.
Blur catalog
Next in Blur
Zoom Blur replaces rotational arcs with streaks that converge toward or away from a chosen centre, with Center Exclusion and quality controls.
