RESOLVE FX · FILM LIGHT SCATTER
Halation.
Build the source first.
Then let the film glow.
A film-specific highlight response with explicit source isolation, dye-layer reflections, secondary support, optional grain and global integration. The key is not a red glow — it is deciding exactly which highlights are allowed to create it.
Color Space · Isolation
Dye · Secondary
Grain · Global · Blend
In the lab, switch Composite → Isolation → Glow only. If the source matte is wrong, changing Strength or Blend is the wrong fix.
THR 0.72SPREAD 0.42Teaching model, not Resolve. It uses encoded-RGB luma, smooth thresholding and simple box-blurred RGB masks to explain the decision order. It does not reproduce Resolve color science, Dye Layer math, Gamma, Film Saturation Level, Fine Tune Relative Spread, Filter, grain or Global Adjustments.
Eight actual Inspector captures + a clearly separated teaching model.
24 visible controls · 2 debug views01SOURCE → REFLECTION → INTEGRATION
Halation is a pipeline, not a red-outline preset.
The effect becomes predictable when isolation, primary reflection and final integration are treated as separate decisions.
Find the halo source first
Halation should not start with Strength. Processing Color Space and Isolation decide which bright regions can generate the effect at all. Threshold sets the low clip, Normalization the high clip, and View Isolated Regions exposes the source matte before reflections are built.
The primary character lives in Dye Layer Reflections
Strength, Gamma, Saturation and Spread define the primary chromatic reflection. Fine Tune Relative Spread can separate RGB distances for subtle structure, but exaggerated separation quickly reads as chromatic aberration rather than film halation.
Secondary Glow and Blend come after the primary shape
Secondary Glow broadens the light spill, Basic Grain adds simplified texture, and Global Adjustments help integration. None of them repairs a bad isolation matte. Build the source matte and primary halo first, then add support layers and the final wet/dry trim.
Blackmagic documents Halation as a film-emulation effect built from Processing Color Space, Isolation, Dye Layer Reflections, Secondary Glow, Basic Grain and Global Adjustments.
02THE ACTUAL RESOLVE 21 PANEL
Use the real Inspector as the control map.
Eight project captures cover the full panel, Processing Color Space menu, isolation, primary reflections, secondary glow, grain and global integration. Captured numeric values are examples, not recipes or claimed ranges.
ASOURCE MATTE
Processing Color Space and Isolation
- Processing Color Space
Defines the space in which the effect evaluates brightness and builds halation. Use timeline is correct only when the timeline space really describes the signal at this point in the chain.
VERIFYAfter a CST/DCTL or manual display transform, re-check this choice; identical Threshold/Spread values in another signal domain are not expected to look identical.
- Threshold
Low clip for regions admitted to the Halation source matte.
VERIFYToo low a value pulls in midtones and ordinary contrast edges; verify with View Isolated Regions.
- Normalization
High clip / normalization of the upper isolated source before reflections are generated.
VERIFYDo not collapse a broad highlight range into one identical white mass without a reason.
- Film Saturation Level
Controls color suppression in the extremely bright part of the source matte; Blackmagic specifically notes its usefulness in HDR workflows.
VERIFYCompare saturated practical lights and very bright HDR highlights in isolated view.
- View Isolated Regions
Displays only the regions from which Halation will be generated.
VERIFYUse it as a mandatory debug mode before tuning Strength and Spread.
BPRIMARY HALO
Dye Layer Reflections
- Strength
Brightness of the primary dye reflection.
VERIFYStart conservatively: a strong halo quickly becomes an object in its own right.
- Gamma
Changes the distribution/shape of the glow around the source.
VERIFYCompare at a fixed Spread: Gamma and halo size are different decisions.
- Saturation
Color intensity of the primary reflection.
VERIFYIf a red outline reads before the material/light, Saturation is usually too high.
- Spread
Spatial extent of the dye reflection away from bright detail.
VERIFYJudge at the actual target resolution: the same spread reads differently at different frame/delivery sizes.
- Fine Tune Relative Spread
Exposes separate reflection distances for R/G/B.
VERIFYKeep channel separation subtle so the effect does not turn into lens chromatic aberration.
CSUPPORT LAYERS
Secondary Glow and Basic Grain
- Secondary Glow · Strength
Brightness of the second, broader glow layer.
VERIFYBuild from zero. If the secondary layer defines the look, you are closer to generic Glow than halation.
- Secondary Glow · Gamma
Distribution shape of the secondary glow.
VERIFYA/B it separately from the primary reflection or it becomes easy to misdiagnose milky highlights.
- Secondary Glow · Spread
Extent of the broader secondary halo.
VERIFYBroad spread is especially visible on practical lights and titles; inspect edges and nearby objects.
- Secondary Glow · Filter
Limits/colors the secondary glow layer.
VERIFYThe filter should support the scene rather than introduce an unrelated new color.
- Append Grain Internally
Enables the simplified Film Grain subset inside Halation.
VERIFYDecide who owns grain: the internal block or a dedicated Film Grain FX. Avoid accidental double grain.
- Grain · Strength / Size / Softness / Saturation
Simplified controls for grain amount, size, softness and color.
VERIFYJudge grain at 100% in motion; for a detailed film-stock workflow use dedicated Film Grain after Halation.
DFINAL INTEGRATION
Global Adjustments and Global Blend
- View Glow Alone
Shows the generated Halation without the underlying image.
VERIFYUse it to find stray halo and identify which layer is actually creating a problem.
- Reduce Highlights
Reduces simple brightening of the source region and keeps the effect more edge-biased.
VERIFYUseful when a practical light swells into a white patch instead of producing a fine halo.
- Aspect Ratio
Stretches/squeezes glow and grain horizontally for anamorphic character.
VERIFYCheck circular practicals and speculars; excessive stretch is immediately obvious there.
- Detail Loss
Defocuses detail under the effect to emulate sharpness the film stock should not have retained.
VERIFYDo not use it as a generic beauty blur; compare fine detail outside the halo and after bypass.
- Global Blend
Final wet/dry mix of the calculated effect with the source.
VERIFYTrim it last. Blend should not hide a wrong Threshold, Spread or Strength.
03FOUR OWNERS, FOUR JOBS
Do not let one layer compensate for another.
Most overcooked halation happens when Secondary Glow or Global Blend is used to hide a weak source matte or poorly shaped primary reflection.
Isolation
SOURCE → MATTEChooses where halation can exist at all. This is the diagnostic foundation of the whole effect.
Midtones and ordinary edges should not flood the isolated matte.
Dye Reflections
MATTE → RGB SPREADBuilds the fine chromatic edge reflection that separates halation from generic bloom.
Make the primary halo convincing before adding Secondary Glow.
Secondary Glow
PRIMARY → BROAD SUPPORTAdds a broader supporting glow with its own shape and Filter.
It should support the primary halo, not become the main visual event.
Global / Grain
INTEGRATE → MIXBasic Grain, Reduce Highlights, Aspect Ratio, Detail Loss and Blend handle integration after the halo is built.
Make the final A/B decision in playback at the target resolution.
Use View Isolated Regions before shaping the halo, then View Glow Alone before final Blend. Those two debug views separate source-selection errors from effect-integration errors.
04LOOK → HALATION → GRAIN
Give halo and grain clear ownership.
A dedicated Halation node is easy to bypass, compare and keep in a stable position relative to CST/DRT. If you need detailed grain, let the dedicated Film Grain effect own it after Halation.
Halation owns source isolation and halo geometry
Confirm Processing Color Space, build the isolated source matte, then shape Dye Layer Reflections. Add Secondary Glow only after the primary halo works.
This is a teaching graph, not a Resolve screenshot. The exact node order remains project-dependent; the important idea is clear ownership and repeatable placement relative to transforms.
Related: node pipeline ↗ · Film Grain ↗
05BUILD IT IN RESOLVE
Four exercises expose four different failure modes.
These are decision-order exercises, not magic values. Tune to the actual signal state, source shot, monitoring path and target delivery.
Subtle film edge
Add a barely perceptible red/orange response around the brightest high-contrast detail.
PrepareUse a shot with a practical light, white reflection or rim light. Keep Halation on its own serial node after the base correction/look shaping.
- 01
Verify Processing Color Space and enable View Isolated Regions.
- 02
Raise Threshold until the matte is confined to genuinely bright sources; use Normalization to preserve useful source-matte gradation.
- 03
Return to the composite and build conservative Strength/Saturation, then shape Spread and Gamma.
- 04
Use View Glow Alone to remove stray halo, then make the final trim with Global Blend.
On bypass the shot should feel slightly more digital, but with the effect enabled the viewer should not notice a separate red outline as an effect.
Neon / saturated practical
Preserve the character of a saturated source without turning the halo into a flat color patch.
PrepareUse a sign, LED or stage light with high saturation.
- 01
Evaluate Film Saturation Level in View Isolated Regions first, especially for HDR material.
- 02
Keep Dye Saturation lower than instinct suggests and find the character with Strength/Gamma/Spread.
- 03
Add Secondary Glow from zero and use Filter only when it supports the surrounding spill.
- 04
Compare RGB Parade and bypass: the glow should not uncontrollably recolor neighboring objects.
The source stays saturated and bright, while the halo has character without looking like a generic neon-glow preset.
Anamorphic integration
Tie the halo to a horizontal anamorphic character without breaking source geometry.
PrepareChoose a shot with several circular practical lights; they reveal excessive stretch immediately.
- 01
Build isolation and the primary halo at Aspect Ratio = 1 first.
- 02
Only then adjust Aspect Ratio gently and compare circular sources before/after.
- 03
If a broader spill is needed, add Secondary Glow, but do not use it to compensate for excessive stretch.
- 04
Check the whole shot in motion and the final encode; fine halo geometry can change after resize/sharpening.
The horizontal character reads as part of the shot's optical language rather than a stretched post effect.
HDR highlight stress test
Verify that isolation and Film Saturation Level preserve extreme highlights without swelling them into white patches.
PrepareUse an HDR shot with bright reflections/practicals and a controlled monitoring path.
- 01
Confirm Processing Color Space for the signal state reaching this node.
- 02
Use View Isolated Regions to inspect Threshold, Normalization and Film Saturation Level on the brightest sources.
- 03
Use View Glow Alone to tune the primary halo and Reduce Highlights rather than trusting a pleasing composite alone.
- 04
Check the waveform/monitoring path and a short target-delivery export.
Extreme highlights still generate halo without clipping or changing character merely because of the display/output path.
06HALATION, GLOW, INTEGRATED LOOK, OR GRAIN?
Choose the tool by responsibility, not by similar thumbnails.
| FX | What it owns | Use it when |
|---|---|---|
| Halation | Dedicated source isolation + dye reflections + secondary glow + grain/global integration. | When you need detailed control over film-halation matte and geometry. |
| Film Look Creator ↗ | Integrated film-look module with simplified Halation alongside grain, bloom, gate weave and other blocks. | When a unified look-building workflow matters more than dedicated Halation controls. |
| Glow ↗ | General highlight glow/light spill without a dye-layer reflection model. | When you need visual glow, neon halo or broad bloom rather than a film-specific cue. |
| Film Grain ↗ | Dedicated grain generator with more detail than Basic Grain inside Halation. | When grain should be a separate production layer for delivery/stock matching. |
07SYMPTOM → CAUSE → FIX
Most bad halation is really bad isolation, excessive support glow, or unstable pipeline placement.
01Red halo appears on skin and midtones+
Threshold is probably too low or Processing Color Space does not match the signal state. Enable View Isolated Regions, tighten the matte, then return to Strength/Spread.
02The effect looks like generic Bloom+
Secondary Glow/Spread is dominating the Dye Layer Reflections. Move Secondary Strength toward zero, reduce broad spread and restore a fine chromatic primary halo.
03Practical lights swell into milky white patches+
Lower Strength, verify isolation and raise Reduce Highlights as needed for an edge-biased halo. Then A/B View Glow Alone again.
04The effect changes dramatically after moving across a CST+
That is expected for a color-space-aware spatial effect. Lock the node placement and re-check Processing Color Space/Isolation for the actual input to that node.
05The texture becomes too dirty after adding Film Grain+
Check whether Append Grain Internally is also enabled. Choose one owner for grain or deliberately separate their responsibilities.
Node placement
A practical starting point is a dedicated Halation node after base balance/look shaping, once bright structures are established. Blackmagic's Colorist Guide shows a separate HAL node in the LOOK chain after Look/Contrast and before Vignette. That is a documented starting point, not a mandatory universal order.
Scopes and debug views
For first-pass tuning, View Isolated Regions and View Glow Alone matter more than conventional scopes because they expose the source/effect matte. Waveform helps reveal swollen highlights/clipping and RGB Parade excessive chromatic bias. Final intensity still belongs to calibrated monitoring and playback.
Managed pipeline
In RCM/ACES, Use timeline can be correct when the timeline really matches the working signal at this point. In manual YRGB with CST/DCTL/output transforms, verify explicitly. Moving Halation across a DRT changes the mathematical source matte, so identical values should not be expected to match.
08BEFORE YOU DELIVER
Approve the matte, the halo, then the encoded result.
The checklist separates source selection, primary reflection, secondary support, grain ownership and final mix so one block cannot hide a problem created by another.
09FAQ
Keep the film-specific distinctions clear.
How is Halation different from Glow?
Halation models a film-specific reflection/scatter around bright high-contrast regions and has dedicated source isolation plus Dye Layer Reflections. Glow is a more general light-halo/spill tool. If broad glow is the main goal, Glow is usually the better owner.
Should Secondary Glow always be used?
No. The actual Resolve capture shows Secondary Strength at 0 as a normal starting state. Make Dye Layer Reflections convincing first and add the secondary layer only when the shot needs broader spill.
Can I leave Processing Color Space on Use timeline?
Yes, when the timeline space really describes the signal entering this node. With manual CST/DCTL or unusual placement, verify it rather than assuming it.
What is Film Saturation Level for?
It controls how the extremely bright part of the source matte loses color/moves toward white. Blackmagic specifically notes its usefulness in HDR so very bright regions can still produce visible Halation.
Should I enable Append Grain Internally?
It can work for a quick integrated look. For detailed production grain, Blackmagic recommends a dedicated Film Grain after Halation. The important part is avoiding accidental double grain.
Why does Halation change after a CST?
Because Threshold/Normalization and the spatial response are now operating on another signal domain. Halation is color-space-aware; moving it relative to a CST/DRT changes the effect input rather than merely reordering identical operations.
Sources and verification boundaries
Visible labels and current Inspector states were checked against eight actual Halation captures stored in the project. Control behavior and workflow notes were cross-checked against Blackmagic documentation. The live lab is an independent teaching model and intentionally does not reproduce Resolve’s proprietary color science, dye-layer math, gamma mapping, film saturation behavior, filter, grain or global-adjustment internals.
This web pass is not a live Resolve-render certification. Final acceptance belongs to the installed Resolve build, actual source footage, calibrated monitoring/scopes, uninterrupted playback and the target delivery encode.