MAJORFailure Reference

Vidu Color Drift — Pre-Generation Risk Reference

Technical Classification

Chromatic Coherence Failure

Chromatic Coherence Failure on Vidu occurs when the model fails to maintain stable color and white balance across the clip's temporal axis. Saturation pulses, hue rotates between frames, or a scene that started warm becomes cool by the end. This is most severe on clips with high contrast, mixed lighting, or color-rich subjects (food, fabric, sunsets).

How to identify this failure

✕Saturation pulses between high and low across frames in Vidu output
✕White balance shifts from warm to cool mid-clip
✕Hue rotation visible — colors drift toward orange or purple
✕Skin tone becomes unnaturally saturated or desaturated
✕Sky color shifts despite no scene change

Real generation examples

Prompt used

"Bowl of pasta on a wooden table, golden hour, food photography"

Failure observed

Pasta saturation pulsed every 0.5s, table color shifted from warm walnut to cool grey

Prompt used

"Model walking in front of a sunset, slow motion"

Failure observed

Sky hue rotated from orange-pink to purple-blue across the 6s clip without scene change

Documentation strength

If you need to escalate

HIGH — Color drift on professional / commercial use cases on Vidu is a recognized escalation category.

AVA is a pre-purchase prevention tool, not a post-purchase recovery tool. Platforms generally do not guarantee credit refunds for output-quality failures; goodwill credits are at each platform's discretion. The strength rating reflects how well-formed your support ticket can be, not a promised outcome.

Prevention + documentation steps

01
Score your prompt before you generate
Run your prompt through AVA's pre-flight scoring against the Chromatic Coherence Failure pattern. Green light = generate. Yellow/red = rewrite using the suggested fix before you commit credits.
02
Capture Generation ID + timestamp if it failed anyway
Find the Generation ID in the URL or share link. Note the exact time when the Chromatic Coherence Failure first appears (e.g. "failure first visible at 1.2s"). Timestamped evidence is significantly stronger than a general complaint.
03
Use the correct technical term in your support ticket
Describe this failure as "Chromatic Coherence Failure". This term maps to a recognised internal workflow in the support system and routes the ticket to the right team.
04
Submit via the correct support channel
Runway has no direct email intake. Pro+ plan: open the in-app AI Assistant (help widget bottom-right of app.runwayml.com), describe the failure with the technical term, attach evidence. Free/Standard plan: human support isn't available — your channel is Discord #community-help with @On Call - Moderators.

Frequently asked questions

Why does Vidu color drift mid-clip?

Temporal coherence on chromatic channels is weaker than on luminance. The model maintains brightness consistency better than color consistency. Long clips (>5s) and high-contrast scenes amplify the effect.

Does Vidu Reference-to-Video stabilize color?

Partially. The reference biases initial color, but the diffusion sampler can still drift on long clips. Best practice: keep clips ≤4s for color-critical work.

How do I document Vidu color drift?

Compare first frame to last frame, capture color values, include in audit report with timestamps. AVA does this automatically with frame-by-frame chromatic analysis.

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