Compare the replacement’s motion blur with the reference scene. A sharply isolated person over a blurred moving background can look pasted in even when the pose is correct. Check timeline alignment, edge coverage and the visible blur direction before applying a whole-frame blur. Use a supported compositor to make a controlled test, preserving recognizable facial and costume details.
Inspect the fastest movement
Choose a swing, turn or arm extension where the source has a clear blurred trail. Compare it with a slower moment in the same shot. This distinguishes a constant cutout rim from an edge mismatch that appears only during fast motion. A sharp first frame says little about the moving composite.
Keep the full source and replacement pass available. If the character’s anatomy itself changes during the turn, blur matching cannot fix that content failure. Likewise, a mask that excludes the source’s soft motion boundary needs coverage repair rather than simple softness added inside a hard silhouette.
Make one controlled test
- Align the source and replacement to the same reviewed interval.
- Compare blur direction and extent at the fastest visible action.
- Inspect the mask’s semitransparent boundary separately.
- Test a restrained supported motion-blur treatment where appropriate.
- Render and judge normal-speed integration before inspecting still details.
Alpha interpretation can also affect a soft boundary; Adobe documents that distinction. Correct interpretation and motion-blur matching solve different problems. Avoid combining them blindly in one large finishing pass.
Preserve useful detail
The goal is coherent movement, not maximum blur. A face should remain recognizable in frames where the reference face is readable. If the chosen replacement needs more smear merely to hide a malformed arm, revise the pass or choose a simpler interval.
Will frame interpolation fix the sticker appearance?
It creates or derives intermediate motion frames where supported. It does not automatically provide the correct matte or camera shutter appearance. Diagnose the edge and timing first, then evaluate interpolation as a separate decision.
Can I use one blur setting for the whole clip?
Only if it fits the visible movement throughout. Fast and still intervals may need different treatment. Compare both and retain an untreated pass so you can revise the integration without regenerating the character.
Sources and scope
This is an original Imagild Editorial workflow guide, assisted by AI and reviewed against the linked sources on October 12, 2026. External tool procedures do not imply that Imagild provides those tools or guarantees their results.