RESOLVE FX STYLIZE · DAVINCI RESOLVE 21
Prism Blur.
Split the light.
Keep the subject.
An optical system, not another generic blur. Learn how the chromatic center, base softness, zoom-aberration trails and true lens vignetting work together. Eight actual controls, five original panel captures, a hands-on lab and four step-by-step practice exercises.
Position X / Y
Distance + Strength
Vignette + Blend
Try VIGNETTE ONLY to prove that the vignette darkens edges — it does not mask the blur. Then switch to RGB BURST and shift Position.
Optical origin · Position X/Y
The cross marks the chromatic-aberration origin. It does not transform or crop the source frame.
Edge darkening · Vignette
Vignette darkens edges; it does not limit where blur or aberration apply. Size = 0 disables vignette in this model.
EDUCATIONAL MODEL · These 0–1 controls are not Resolve OFX ranges. Optical sampling, vignette falloff, edge handling, color management and output will differ from DaVinci Resolve. All actual parameter labels are shown in the screenshots below.
5 original Resolve PNGs · native control explanations · RU/EN
8 controls · 4 workshops01THREE SEPARATE MECHANISMS
Blur, aberration and vignette are three separate jobs.
Treat each contribution independently before mixing them. A clean result comes from ordering the decisions, not from lowering one slider until everything looks barely visible.
Blur is not aberration
Blur Strength softens the primary picture. Aberration Distance and Strength contribute radial colored trails independently. These are distinct choices, not interchangeable controls.
The center shapes direction
Position X/Y establish the origin of chromatic aberration. Farther edges can make the directed color separation more apparent.
The vignette darkens edges
Vignette Size and Sharpness shape peripheral luminance falloff. It is not a Power Window, not an aberration mask and not a substitute for local node masking.
Parameter definitions checked against: Blackmagic Design · Resolve 21.1 Manual ↗ · Ch. 165 · Prism Blur ↗
02NATIVE RESOLVE CONTROLS
Eight controls, explained without made-up ranges.
Match each label to an actual captured panel. Photo values are a saved state, not a preset or proof of the full range. The independent demo above uses normalized settings.
01 / GEOMETRY
Optical center
- Position X
Horizontal coordinate of the origin for radial chromatic aberration. It is not Sizing X and does not shift the whole picture.
Try thisShift the center left/right across bright vertical edges: the orientation of color fringing changes relative to the origin.
- Position Y
Vertical coordinate of the same origin. You may animate X/Y to follow a subject, but verify the result against actual movement in the shot.
Try thisWith Distance and Strength fixed, compare fringes near the top and bottom of the frame.
02 / IMAGE BLUR
Base image softness
- Blur Strength
Blurs the primary image. It contributes overall softness; it does not set vignette strength or RGB separation.
Try thisWith aberration minimized, raise Blur Strength and watch eyelashes, facial detail and small typography.
03 / OPTICAL SPLIT
Chromatic fringes and radial smear
- Aberration Distance
Controls how far the aberration shifts from the original image. Increasing Distance widens color fringes at high-contrast edges.
Try thisFix the center and raise Distance on white-edged content. Do not try to rescue overly wide fringes using only Blend.
- Aberration Strength
Intensifies the zoom-blur component used to form chromatic aberration. This is not merely opacity of an RGB layer: the character of the smear changes.
Try thisHold Distance steady and adjust Strength; watch the structure and intensity of colored trails around specular highlights.
04 / VIGNETTE
Edge darkening, not a blur mask
- Vignette Size
Sets the extent of optical edge vignetting. The manual describes 0 as no vignette and 1 as its maximum extent. This is not a mask limiting the Blur Strength effect.
Try thisSet Size to 0 as an isolation check: edge darkening should vanish even when blur and aberration remain visible.
- Vignette Sharpness
Adjusts the falloff of the vignette. Lower values soften the edge, higher values make the transition sharper, but the effect is never described as a perfectly hard mask.
Try thisCompare on a plain wall or sky. An abrupt transition may show an obvious ring, especially after contrast adjustments.
05 / DELIVERY
Final effect mix
- Global Blend
Mixes original and processed images. Shape the light and edge character first, then reduce the overall contribution as necessary.
Try thisCompare Blend=0 and Blend=1 at equal viewer scale and on a short export; watch thin edges for distracting shimmer in motion.
03OPTICAL INTENT
Three looks, three different priorities.
Start with a goal rather than someone else’s exact numeric preset. The same settings behave very differently on clean highlights and compressed footage.
SUBTLE / LENS
Subtle lens character
Gentle blur, restrained colored fringing and a soft vignette without crushed corners. Check skin and bright edges at full-frame view.
At ordinary viewing scale, the viewer notices light shaping rather than an artificial RGB split.
DREAM / MUSIC VIDEO
Dream states and highlights
More softness and visible fringes around highlights. Position the aberration origin near a story-relevant light or face.
Eyes and the subject remain readable; optical trails do not erase all meaningful texture.
TRANSITION / IMPACT
Short intentional impact
Animate a brief optical burst and return to neutral. Restrict the node via Power Window if only part of the frame should be affected.
The image is stable before and after the accent. Motion playback shows no unintended dark ring.
The vignette is not the range-of-influence mask for blur or RGB separation. For a local stylization use a Color node’s Power Window (and Tracker if movement requires it).
04COLOR NODE GRAPH
One optical task — one Color node.
Open Effects on the Color page, find Prism Blur under Resolve FX Stylize and apply it to its own serial node. Keep the primary grade separate so bypass remains meaningful.
Shape the optical treatment
Place Position, tune Blur Strength, then set Aberration Distance and Strength. Shape vignette separately; Global Blend comes last.
Green lines represent RGB signal flow; the dashed branch is a note, not a wiring connection. This interactive schematic is not a real Resolve screenshot.
Related lessons: Color node order ↗ · Power Windows / Tracker ↗
05BUILD AND VERIFY IN RESOLVE
Four tasks. Four observable outcomes.
These are reproducible teaching exercises — not certified effect presets. Verify each workflow on your installed Resolve version and watch a short encoded export.
Clean optical portrait
Add character without sacrificing the eyes.
PrepareClose portrait with one bright background point.
- 01
Apply Resolve FX Stylize → Prism Blur to a dedicated Color node after a neutral base grade.
- 02
Place Position near the face and start with low Blur Strength.
- 03
Add a small Aberration Distance, then adjust Strength against highlights.
- 04
Shape the vignette separately with Size/Sharpness and finish with Global Blend.
Face edges remain coherent, bokeh gains character, and useful corner detail remains visible.
Neon light without RGB clutter
Deliberate aberration for a night exterior.
PrepareNight city frame with point lights and hard-sign edges.
- 01
Reduce distracting noise before Prism Blur to avoid amplifying artifacts.
- 02
Anchor Position to the light source that matters in the scene.
- 03
Adjust Distance for the spatial extent and Strength for the trail character.
- 04
Add only as much blur as needed; inspect the legibility of signs.
Fringes feel intentional, while signs and other story-critical elements stay readable.
Isolate the vignette
See what Size/Sharpness do without unrelated optical changes.
PrepareA fairly even bright surface: wall or sky.
- 01
Minimize Blur Strength and both Aberration controls.
- 02
Check Vignette Size=0 first: there should be no edge darkening.
- 03
Increase Size gradually and compare Sharpness at fixed Size.
- 04
Restore the node to the grade and check the vignette after exposure correction.
You see edge falloff, not a blur radius, and no artificial hard-edged central mask.
Prism burst on a cut
Create a brief emphasis without wrecking the whole shot.
PrepareTwo neighboring shots with a compatible center of attention.
- 01
Set Position on the dedicated Prism Blur node at the start of the burst.
- 02
Keyframe Aberration Distance and Strength over a short span.
- 03
Synchronize the blur peak with the chromatic effect peak.
- 04
Return controls toward neutral with keyframes, confirm Blend and review the export.
The picture is clean before and after the burst with no unexpected dark corners or trailing RGB artifacts.
06RELATED FX
Choose by mechanism, not by name.
Optical distortions, plain blur and illustration may look related in a thumbnail but solve different problems.
| FX | Core difference | When to explore |
|---|---|---|
| Prism Blur | Blur + radial chromatic aberration + vignette. | Optical fringes, dream looks and neon accents. |
| Lens Distortion ↗ | Warps image geometry to emulate optical distortion; not a replacement for softness or vignetting. | Lens distortion correction or stylization, especially of straight-line geometry. |
| Gaussian Blur ↗ | Neutral spatial softness without built-in chromatic aberration. | Background defocus and controlled detail reduction. |
| Pencil Sketch ↗ | Transforms picture details into lines, tone and a pencil-like texture. | Illustration, drawn graphics and sketch transitions. |
| Light Rays ↗ | Generates light rays from bright regions, not radial RGB splitting. | Dramatic light sources and atmospheric shafts. |
07SYMPTOM → DECISION
Diagnose the component before lowering Blend.
01Corners have become excessively dark+
This is a Vignette concern, not Blur Strength. Temporarily set Size to 0, then reintroduce it gently and soften falloff with Sharpness. Recheck after exposure corrections.
02Colored fringes stay too wide even at low Blend+
Reduce Aberration Distance first: it shapes the spatial spread. Then tune Strength for the smear character; Blend cannot fix the underlying geometry.
03Softness destroys a face or text+
Reduce Blur Strength. If you only need colored aberration, keep blur low. For a localized treatment, use a Power Window on the node rather than trying to mask it with vignette.
04The optical center looks misplaced+
Inspect Position X/Y using the final aspect ratio and crop. Sizing and reframing can change the apparent direction of the chromatic trails.
05Motion creates noisy multicolored clutter+
Avoid raising Distance and Strength simultaneously without watching motion. Reduce aberration on noisy fine detail, then review playback and the exported clip.
06The effect goes flat after Global Blend+
Return Blend to full contribution for diagnosis, balance Blur, Distance, Strength and Vignette, then use Blend for final mix. Blend is not a substitute for internal tuning.
Review in motion
Colored fringes around hair, highlights or fine graphics may look acceptable in a still but distracting in motion. Review a short passage at normal speed and delivery resolution.
Check before and after export
Fit view hides some fine contours; high zoom exaggerates them. Check both, inspect encoded output and ensure the vignette does not hide important corner detail.
08DELIVERY CHECK
Check the footage, not just the sliders.
Manual checklist — not an automatic image-quality verdict. It helps keep the review consistent across shots.
09IMPORTANT DISTINCTIONS
Avoid the common Prism Blur misconceptions.
How is Prism Blur different from Gaussian Blur?
Prism Blur combines softness with radially directed chromatic aberration and a vignette. Gaussian Blur is a spatial blur without integrated color separation and vignette.
Does Position move the footage?
No. Position X/Y defines the origin of chromatic aberration; it is not a Transform/Sizing control.
Does Vignette Size limit where Blur works?
No. The Resolve 21 manual describes Vignette Size as edge vignetting: 0 removes it and 1 is the largest size. Use a Power Window on the Color node to localize the FX.
Is Aberration Strength just RGB-layer opacity?
No. The manual calls it an intensification of the zoom-blur component of the chromatic-aberration effect. Distance shapes spatial separation; Strength changes trail intensity and character.
How do I get fringes without heavy blur?
Keep Blur Strength low, then tune Aberration Distance and Strength separately. Vignette is independent: set Size to 0 if you do not need darkened edges.
Why does the interactive lab differ from Resolve?
The lab is an independent educational pixel model of spatial blur, radial RGB trails, vignette and blending. The proprietary Resolve OFX uses its own algorithms, parameter mapping, color management and edge treatment.
Sources and limitations
The source ZIP contains five genuine Prism Blur interface captures. Parameter names and vignette behavior were checked against the Resolve 21 manual. The interactive preview is an independent normalized RGBA teaching model, not Blackmagic’s OFX implementation.
The demonstrations are conceptual. We do not claim matching Resolve blur kernels, aberration sampling, slider scales, color management, performance or edition compatibility. Exercises require validation in a live Resolve project.