Resolve FX · Blur · 03
Directional Blur stretches image detail along a controlled angle instead of blurring equally in every direction. It is useful for directional motion-like smears, transitions, stylised streaks and local effects where the direction itself is part of the visual idea.
The page follows the real DaVinci Resolve 21 panel: Blur Strength, Blur Angle, Blur Type, Symmetric Blur, channel controls, Border Type, Blur Alpha and Global Blend.
Controls
The key idea is simple: Strength defines how far the image is smeared, Angle defines where it travels, and the remaining controls decide how natural, stylised and technically clean that smear becomes.
Directional Blur differs from a uniform blur because it stretches detail along a chosen direction. Blur Strength controls the length and visibility of the smear, Blur Angle rotates that direction, and Symmetric Blur distributes the effect symmetrically around the original detail.
Blur Type changes the visual character rather than the direction. Realistic is useful when the result should feel more natural and stay visually restrained. Stylized makes more sense when the directional smear is intentionally used as a visible graphic treatment.
Channel Adjustment controls the Red, Green, Blue and Alpha contribution independently. Equal values keep the effect neutral. Unequal values can create a more stylised channel-split character, but for ordinary grading they should be changed deliberately.
Advanced Controls define how the directional blur behaves at frame edges and when alpha is involved. Border Type determines how missing edge information is handled, Blur Alpha includes the alpha channel, and Global Blend controls the final amount of the complete effect.
Realistic vs Stylized
Keep Realistic when the directional blur should support the shot without looking like a graphic effect. Switch to Stylized when the smear itself is part of the design.
Use Realistic when the directional smear should feel integrated with the shot and the viewer should notice the motion or softness before noticing the effect itself.
Stylized is appropriate when the blur is meant to read as a deliberate graphic treatment: transitions, energetic promos, music visuals or other expressive edits.
Practical use
A controlled angle can reinforce the perceived direction of fast movement without applying a uniform blur to the entire frame.
Stylized mode and stronger settings can turn the blur into an intentional transition or design element.
Different RGB multipliers can create controlled colour separation inside the directional smear.
Put the FX on a dedicated node and restrict it with a Power Window, Qualifier, Magic Mask or another key source.
Node workflow
Do not mix directional blur with primary balance or unrelated creative corrections.
Find the direction that supports the shot, then increase the blur amount only as much as needed.
Use the blur type as a creative decision, not as a quality switch.
Check the frame borders, alpha behaviour and pull the final effect back until it supports the shot.
Typical mistakes
A strong blur at the wrong angle feels random. Find the motion or compositional direction first.
Realistic and Stylized are different visual intentions. Stylized is not simply a better rendering mode.
Per-channel adjustment becomes visible very quickly and can turn a clean blur into a colour-fringing effect.
Directional smears can reach the border more aggressively than a short uniform blur, so Border Type deserves a quick check.
Directional Blur vs Box Blur
Choose Directional Blur for a single controlled vector: a smear that should clearly travel along a chosen angle.
Box Blur is more appropriate when the task is built around horizontal/vertical control, iterations and a broader non-vector blur structure.
Directional Blur builds blur along a chosen Angle, so it is no longer just softening: direction becomes part of the composition and should relate to real or stylised motion in the shot.
| Control / layer | Meaning | Inspection point |
|---|---|---|
| Angle | Orientation of the smear in the frame. | Compare it with actual motion flow or dominant composition lines. |
| Strength | Visible length/intensity of the directional blur. | Excessive values split contours and destroy form. |
| Symmetry / Type | Changes how smear is distributed around the source and the profile it uses. | Inspect the leading and trailing edge of moving subjects. |
| Channels / Border | Per-channel stylisation and long-streak behaviour at frame edges. | Check coloured trails and frame boundaries at strong Strength. |
Likely cause: Angle does not match motion/perspective.
Fix: Follow the subject trajectory rather than a convenient degree value.
Likely cause: Strength/Symmetry are too aggressive.
Fix: Reduce smear and compare blur types.
Likely cause: A long streak runs beyond available frame data.
Fix: Change Border Type or reduce the effect near the edge with a mask.
Strong streaks and higher quality cost more, especially at 4K/8K. For animated transitions, establish geometry first, then judge final quality settings.
Angle and Strength can be keyframed. If blur follows acceleration, the Strength curve should generally follow motion speed; Resolve 20+ exposes FX keyframes and curves directly.
Keep the effect on its own node. For a motion accent, establish the signal/grade first, add the streak, then leave final grain/sharpening after it.
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
aperture and bokeh profile
optical defocus character without depth analysis
discrete cells and pixelation
detail concealment and graphic stylisation
rotation around a centre
spin, vortex and rotational motion
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
It blurs or smears image detail along a chosen angle instead of spreading the blur evenly in every direction. Blur Strength controls the amount and Blur Angle controls the direction.
They define different visual characters. Realistic is suited to a more restrained natural-looking directional smear, while Stylized is intended for a more obvious graphic treatment.
It keeps the directional blur distributed symmetrically around the original detail, which is useful when you want an even smear rather than a strongly one-sided visual push.
They let you control how strongly each channel participates in the blur. Equal RGB values keep the result neutral, while different values can create intentional colour separation.
Use Directional Blur when the angle and direction of the smear matter. Use Box Blur when you need a more general blur with H/V splitting, iterations and per-axis control rather than a single directional vector.
Continue the catalog
H/V controls, iterations, border behaviour and alpha.
Depth-aware focus, bokeh, lens behaviour and grain.
Return to the Resolve FX catalog to compare the full Blur & Focus family.
Next in Blur
Gaussian Blur is the smoother neutral option when you need H/V splitting, channel controls, Border Type, Blur Alpha and Global Blend.
