RESOLVE FX · AIM THE RUSH
Zoom Blur.
Aim the center.
Then stretch depth.
Zoom Blur is a center-driven speed effect. Its rays converge through Center Position, while Blur Type decides whether the amount is controlled by Realistic Zoom Amount or Stylized Smooth Strength. Center Exclusion, channels, Quality, Border Type, sizing behavior, alpha, and Blend then decide whether the rush remains readable and technically clean.
Position X + Y
Type + Amount
Exclusion + Quality + Border
Start in the Ray chart. Move Position X/Y before increasing the signed demo amount, then raise Center Exclusion. Switch Blur Type and note that the lab label changes from Demo Zoom Amount to Demo Smooth Strength, mirroring the conditional-control idea without claiming Resolve’s internal scale.
INPUTZOOMChannels and alpha in the model
The gold marker is the teaching Center Position. Center Exclusion defines a protected radius in this model. Unequal RGB values change radial smear per channel. Quality only changes sample count here; it does not model Resolve’s internal quality algorithm.
Independent teaching visualization, not Resolve. The Realistic demo amount is signed while the Stylized demo is nonnegative; both are normalized factors chosen for this renderer, not Resolve’s Zoom Amount or Smooth Strength scale. Realistic/Stylized weighting, Quality sampling, Border behavior, Center Exclusion falloff, color management, and all numeric mappings are illustrative.
Actual Resolve captures + an explicitly independent perspective-rush teaching renderer.
14 + 1 conditional controls · 3 captures · 4 exercises01THE PERSPECTIVE MODEL
Zoom Blur is defined by rays through a center, not by one horizontal or rotational vector.
Once that geometry is clear, the panel becomes easier to read: Center Position aims the rush, Blur Type chooses the model and amount control, and Center Exclusion decides where streaking begins.
Center Position defines the perspective rush point
Zoom Blur builds streaks along rays that pass through Center Position. The center is therefore not a decorative coordinate: it decides where the frame appears to accelerate toward or radiate from. The same amount reads as three different motions when the center sits on a face, a road vanishing point, or outside the frame. Resolve's internal OFX formula is proprietary, so this is a practical geometric model rather than a claim to reproduce its sampling.
Realistic and Stylized use different amount controls
In Realistic mode, Zoom Amount is active: the manual describes it as bidirectional, with 0 meaning no blur, positive values expanding the smear outward from Position and negative values producing the opposite scale direction. In Stylized mode, Smooth Strength is used instead. Documentation, keyframes, and recipes therefore need to be read in the context of the current Blur Type rather than treating Zoom Amount as a universal strength control.
Center Exclusion, channels, Quality, Border, and sizing shape the technical result
Center Exclusion moves the start of the blur away from the XY center and can keep the central region readable. RGBA controls scale the effect by channel. Quality changes the processing mode, Border Type supplies samples beyond the frame, Move With Sizing preserves the blur center's relative position through Input/Editing sizing, Blur Alpha includes transparency, and Blend restores source after the geometry has been formed. These controls solve different problems and should not substitute for one another.
Current control semantics checked against DaVinci Resolve 21.1 Reference Manual ↗
02THE ACTUAL PANEL
Fourteen controls are visible in the captured Realistic state; Smooth Strength is the conditional Stylized alternative.
The screenshot viewer stays next to the explanations so captured values are never confused with recommendations. The full screenshot is Realistic, which is why it shows Zoom Amount rather than Smooth Strength.
Amount, Type, and protected center
Choose the blur model first, then tune the amount control that belongs to it.
- Zoom Amount
The amount control for Realistic mode. Resolve 21.1 documents it as bidirectional: 0 means no blur, one side stretches streaks outward from Position and the other reverses the scale-smear direction. This is Resolve's own scale, not a percentage of camera zoom.
CHECKThe captured Realistic panel shows Zoom Amount = 0.400. Do not copy that value as a preset, and do not expect this slider in Stylized mode, where a different control appears.
- Smooth Strength
The conditional amount control for Stylized mode. It sets the strength of the simple smooth digital blur and appears instead of Zoom Amount. This is an important current-panel distinction and should not be treated as a mere rename of one slider.
CHECKIf a tutorial says to animate Zoom Amount, check Blur Type first. In Stylized mode the keyframe belongs on Smooth Strength, so the instruction otherwise refers to a different effect model.
- Blur Type
Realistic emulates photographic motion blur, while Stylized produces a simple smooth digital blur. The choice changes both streak character and which amount control is exposed at the top of the panel.
CHECKCompare the modes at the same Center Position, Center Exclusion, channels, and Blend. Otherwise the visual difference is mixed with changes in geometry and final mix.
- Center Exclusion
Controls the distance from the XY Position before Zoom Blur begins. This can keep a small central region more stable without moving Center Position itself.
CHECKCenter Exclusion is not an object mask. A moving face or logo may still require tracking or a Window when the protected region has to follow the subject.
Channel Adjustment
RGBA controls scale streak strength by channel; they do not adjust exposure.
- Red
Scales red-channel Zoom Blur relative to the overall amount. The captured 1.000 value is a neutral state.
CHECKSeparate RGB only intentionally: on white titles and hard edges, channel divergence quickly turns into visible colored fringes.
- Green
Scales green-channel blur. Equal Red, Green, and Blue values keep the geometry chromatically aligned.
CHECKIf unwanted color fringing appears, compare the RGB multipliers before changing Center Position or Quality.
- Blue
Scales blue-channel blur relative to the overall amount. It can be offset for graphic chromatic streaks, but that is a stylization choice.
CHECKCheck highlights, UI, and small type because chromatic smear is most obvious there.
- Alpha
Scales alpha-channel blur relative to the overall amount. This is a separate multiplier from the Blur Alpha checkbox.
CHECKOn ordinary opaque footage the difference may be invisible. Test it on keyed graphics, lower thirds, and material with actual transparency.
Center Position and Quality
The center sets perspective; Quality changes sampling, not motion direction.
- Position X
Horizontal Center Position coordinate. The captured 0.500 means frame center, but a working point usually belongs on the subject, a vanishing point, or an intentionally off-frame compositional center.
CHECKPlace X/Y before increasing amount. Strong blur around the wrong point is harder to diagnose than a weak one.
- Position Y
Vertical coordinate of the same Center Position. X and Y together define every Zoom Blur ray.
CHECKFor a moving subject, do not keyframe the center blindly by two numbers; use viewer controls/tracking and review the trajectory across the entire segment.
- Quality
Faster, Better, and Enhanced change the processing mode. Blackmagic notes that Better/Enhanced are intended to improve sharp image content at low blur values; if that does not apply, Faster may work just as well.
CHECKDo not treat Enhanced as an automatic final preset. Compare a short target-resolution export where the difference is actually visible and account for render cost.
Edges, sizing, alpha, and mix
After geometry, verify frame edges and coordinate behavior.
- Border Type
Defines how data is supplied when radial sampling leaves the source raster: Black, Replicate, Reflect, or Wrap-Around. The full capture shows Replicate; evaluate the exact enabled state in the installed version and current setting combination.
CHECKStrong Zoom Blur inevitably reaches toward or beyond frame edges, so judge edge artifacts on the actual shot rather than only in the viewer center.
- Move With Sizing
The manual says this keeps the blur center at its relative frame position when Input or Editing sizing changes. It matters with crop, zoom, and reposition operations that move the subject relative to the raster.
CHECKThe checkbox does not erase operation order. Test the actual node tree across the full animated segment, especially when sizing is keyframed.
- Blur Alpha
Includes the alpha channel in the blur itself. This differs from the Alpha multiplier above: the checkbox enables alpha processing, while the multiplier scales its relative strength.
CHECKOn keyed graphics, disabling Blur Alpha can leave hard matte edges while RGB is heavily streaked. Check straight/premultiplied behavior in the real composite.
- Blend
The slider inside Global Blend mixes the completed Zoom Blur result with the source. The captured 1.000 is full effect contribution.
CHECKBlend is the final dry/wet. It does not fix a wrong center, inappropriate Border Type, or excessive Center Exclusion; fix the cause first, then dose the result.
03TWO BLUR MODELS
Realistic and Stylized change both the character and the amount control you animate.
This is the most important correction to the old page. Zoom Amount belongs to Realistic. Smooth Strength belongs to Stylized. Center Exclusion remains a separate radius around the same Center Position.
Realistic
Zoom Amount · bidirectionalPhotographic motion-blur character. Uses Zoom Amount, which can reverse the scale-smear direction relative to Position.
Stylized
Smooth Strength · digitalA simple smooth digital blur. Uses Smooth Strength instead of Zoom Amount and suits more graphic streak or transition behavior.
The captured Blur Type menu proves the two style names. The conditional Smooth Strength behavior comes from the current manual because the archived full-panel screenshot is in Realistic mode. Do not invent a Smooth Strength value from that image.
04QUALITY, EDGES, AND COORDINATES
Quality is not strength, Border Type is not masking, and Move With Sizing is not tracking.
These controls sit in the technical half of the effect. They should be judged only after center, model, amount, and exclusion are already correct.
Faster
A responsive starting point. Blackmagic notes it can be sufficient when the shot does not need extra preservation of sharp content at low blur values.
Better
A more careful mode for cases where sharp lines and fine detail matter at low blur amounts. Compare it against Faster on the actual shot.
Enhanced
Another quality tier for difficult low-blur detail. It does not have to improve every shot; make the final decision from render/export comparison.
Black
ABC | ░░░Pixels beyond the raster are treated as black. Strong rush can pull in dark edge contamination.
Use it only when that edge falloff is intentional.
Replicate
ABC | CCCExtends the nearest edge pixel. Often a safe starting point for footage.
Watch for banding when the edge is high-contrast and the streak is long.
Reflect
ABC | CBAMirrors image content beyond the boundary and can preserve texture continuity better.
On recognizable objects, the mirror repeat can be more obvious than Replicate.
Wrap-Around
ABC | ABCPulls data from the opposite side of the raster. Useful for tile-like graphics and risky for ordinary footage.
Check that the opposite edge does not enter the streak as an unexpected seam.
The letter strings are explanatory edge-extension diagrams, not literal Resolve pixels. The current manual documents Black, Replicate, Reflect, and Wrap Around for Zoom Blur. The archived full panel shows Border Type as Replicate in a disabled-looking state; this guide does not infer a hidden enable rule from one screenshot. Verify the enabled state in the installed build and current setting combination.
05FROM SIGNAL TO RUSH
Keep the speed effect isolated, the center auditable, and tracking separate from exclusion.
A dedicated node makes it easier to separate primary grading, localization, center geometry, conditional amount animation, sizing behavior, and final approval.
Aim the center, then animate the correct amount control
For a full-frame rush, set Center Position first. Realistic uses Zoom Amount; Stylized uses Smooth Strength. Then tune Center Exclusion, channels, Quality, Border Type, Move With Sizing, Blur Alpha, and final Blend.
Green lines show image flow. The dashed matte note is not another serial node. Center Position and Center Exclusion belong to Zoom Blur itself; a Window/tracker localizes where the node contributes. For crop/zoom/reposition workflows, test Move With Sizing in the real project because coordinate order matters. This is a teaching graph, not a Resolve screenshot.
Related Color workflow: node pipeline ↗ · Power Windows / Tracker ↗
06BUILD IT IN RESOLVE
Four exercises isolate four different weak points: aiming, signed amount, graphics/alpha, and sizing.
These are teaching workflows, not one-click presets. Use the installed Resolve build, your own material, and playback/export checks.
Short punch-in toward a subject
Build a fast rush that drives attention toward the subject without turning the frame into an unreadable tunnel.
PrepareUse a clip with a clear subject and a short 6–12-frame accent. Keep the effect on a dedicated node.
- 01
Place Center Position on the subject or vanishing point before increasing amount.
- 02
In Realistic, animate Zoom Amount from 0 to the working value and back; in Stylized, use Smooth Strength.
- 03
Raise Center Exclusion only enough to stop the central key detail from disappearing too early.
- 04
Compare Faster and Better at the final timing, then verify Blend and a target-resolution export.
The rush has a clear destination, the central subject stays readable at the intended moment, and the edges do not produce accidental seams or dark contamination.
Reverse scale-smear in Realistic
Understand bidirectional Zoom Amount and separate it from the idea of simply making blur stronger.
PrepareUse a static or slow shot with obvious perspective lines and an easy-to-see center.
- 01
Choose Realistic and lock Center Position to the vanishing point.
- 02
Compare small positive and negative Zoom Amount values while keeping every other control unchanged.
- 03
Do not compensate direction with Blend or channels; the exercise is specifically about seeing the scale-smear reverse.
- 04
Check frame edges with the chosen Border Type and a short export.
The visual scale-smear direction changes through the sign of Zoom Amount while Center Position remains the same anchor.
Graphic Stylized streak for a title or logo
Create a clean design accent while explicitly testing channels and alpha.
PrepareUse a title/logo with transparency or a graphic element on its own node.
- 01
Switch Blur Type to Stylized and work with Smooth Strength rather than Zoom Amount.
- 02
Place the center compositionally; it does not have to remain at 0.500/0.500 when the logo is off-center.
- 03
Check Blur Alpha and the Alpha multiplier on real transparency. For a chromatic streak, offset one RGB channel slightly and return it to 1.000 after comparison.
- 04
Set final intensity with Blend without rebuilding geometry that is already correct.
The RGB streak is intentional, the matte does not stay unnaturally hard relative to the image, and the source logo remains recognizable at the intended animation phase.
Center Position through crop/zoom/reposition
Verify Move With Sizing in the real coordinate pipeline instead of trusting the checkbox label.
PrepareUse a clip where Input/Editing sizing visibly changes framing and the blur center belongs to a specific object.
- 01
Set up Zoom Blur before sizing and confirm the center truly belongs on the subject.
- 02
Apply the working crop/zoom/reposition and compare Move With Sizing on and off.
- 03
Check the beginning, middle, and end of the keyframed transform; one setup frame is not enough.
- 04
After coordinate behavior is correct, revisit Center Exclusion and Border Type because the new framing can change both visual risks.
The blur center remains compositionally tied to the subject throughout the transform, and edge behavior is approved after final framing.
07CHOOSE THE RIGHT GEOMETRY
Zoom Blur is for a rush through a point, not every kind of motion softness.
| FX | What shapes the result | Explore it for |
|---|---|---|
| Directional Blur ↗ | Linear streak along one Blur Angle. | Whips, pans, vehicles, and other one-direction smears. |
| Radial Blur ↗ | Arcs around Center Position; spin instead of perspective rush. | Wheels, spinning objects, and orbit-like transitions. |
| Zoom Blur | Radial streaks toward/from Center Position; Realistic/Zoom Amount or Stylized/Smooth Strength. | Punch-ins, pull-outs, tunnel/rush motion, speed accents, and centered graphics. |
| Gaussian Blur ↗ | Neutral smooth H/V blur without motion geometry. | General softening, detail reduction, and backgrounds. |
| Lens Blur ↗ | Defocus and bokeh through an aperture model. | Optical-style defocus and highlight bokeh rather than speed streaks. |
08DIAGNOSE THE RUSH
Most failures point to the wrong center, the wrong amount control, exclusion, sizing, edges, or quality expectations.
01The rush points somewhere unrelated to the subject+
Reduce amount and place Position X/Y first. If the subject moves, separate tracking/localization from Zoom Blur's own geometry.
02Zoom Amount is missing in Stylized mode+
This is expected: current Resolve uses Smooth Strength for Stylized. Zoom Amount belongs to Realistic. Changing Blur Type swaps the amount control.
03The center still becomes unreadable+
Reduce amount and tune Center Exclusion. If a specific moving object must remain protected, use a tracked Window or matte; Exclusion is geometry around the center, not a semantic mask.
04The center drifts after crop or zoom+
Check Move With Sizing and the actual Input/Editing sizing order. Then watch the full keyframed segment; coordinate order cannot be certified from one still frame.
05Edges show dark bands, repeats, or seams+
Compare Black, Replicate, Reflect, and Wrap-Around at the same working amount. Border Type does not change center or amount; it only supplies samples beyond the raster.
06Enhanced looks almost identical to Faster+
That is not necessarily a problem. The manual specifically frames Better/Enhanced around sharp content at low blur values. If your shot shows no meaningful difference, Faster can be the rational choice.
Approve the center before strength
A small amount quickly reveals where the rays converge. At strong blur, a center error is masked by the overall aggression of the effect and often leads to pointless Blend or Quality adjustments.
Choose Quality from the problem footage
The value of Better/Enhanced shows up on sharp detail at low blur amounts. Compare that kind of scene at target resolution rather than an abstract test chart with extreme blur.
Approve after motion, sizing, and export
Zoom Blur is often animated alongside transforms. Watch the entire segment, check Move With Sizing, edges, and alpha, then make a short export. A setup frame does not certify timing or coordinate stability.
09BEFORE YOU DELIVER
Check the center, conditional amount, sizing, edges, alpha, and final motion.
The checklist is a reminder, not automated certification. A speed effect that looks convincing on one still can fail immediately when animated.
10QUESTIONS THAT MATTER
Keep center, blur model, amount, exclusion, quality, and final mix separate.
What does Zoom Blur do in DaVinci Resolve?
It creates motion-blur streaks along rays tied to Center Position, simulating camera movement toward or away from the image. The key decisions are Blur Type, its corresponding amount control, Center Exclusion, and Position X/Y; channels, Quality, Border Type, Move With Sizing, Blur Alpha, and Blend handle the technical finish.
Why is Zoom Amount missing in Stylized?
Because Resolve 21.1 uses different controls for these modes. Realistic exposes bidirectional Zoom Amount, while Stylized uses Smooth Strength. This is normal conditional panel behavior.
What does Center Exclusion do?
It sets the distance from Center Position before Zoom Blur begins. A small value lets streaking approach the center; a larger value leaves a calmer central area. It is a geometric control, not an object mask.
How is Zoom Blur different from Radial Blur?
Zoom Blur builds straight radial streaks toward/from a center and reads as depth motion. Radial Blur smears detail along arcs around the center and reads as rotation. Both use Center Position, but their motion geometry is different.
Should I always use Enhanced Quality?
No. Blackmagic notes that Better/Enhanced improve sharp image content at low blur values. If that is not relevant to the shot, Faster may look just as good and be faster. Compare at target resolution.
What is Move With Sizing for?
It preserves the blur center's relative position when Input or Editing sizing changes. That helps with crop/zoom/reposition workflows, but the actual coordinate-operation order still needs to be tested in your node tree.
When do I need Blur Alpha?
When the input contains real transparency and the matte must participate in the streak. On opaque footage the difference may be invisible. Do not confuse the Blur Alpha checkbox with the Alpha multiplier in Channel Adjustment; they control different things.
Sources and the scope of this guide
Visible control names, menu labels, and captured values were checked against the actual DaVinci Resolve screenshots shown on this page. Conditional Smooth Strength behavior, Zoom Amount directionality, Center Exclusion, channel semantics, Center Position, Quality guidance, Border Type, Move With Sizing, and Blur Alpha were cross-checked against current Resolve 21.1 documentation. The interactive lab is an independent teaching renderer and does not claim Resolve’s proprietary OFX kernel or numeric scales.
The four exercises were not certified by a live Resolve render inside this web-editing pass. Edition availability, GPU performance, exact conditional UI state, and small interface differences should always be verified in the installed production build.