Negative prompts can help narrow a Seedance 2.5 brief, but they are not a guarantee that unwanted details will disappear. Start by stating the subject, action, camera, and ending positively. Add a short, specific exclusion only when a visible failure needs to be constrained.
Quick answer
Use negative prompts for concrete risks such as extra people, an unwanted camera orbit, a second product, or new readable text. Avoid a long list of vague words like “bad, ugly, low quality.” Those words do not define a visual outcome. A clearer workflow is: describe the desired frame first, name one failure, add one precise limit, then review the complete clip.
Positive direction comes first
Before adding exclusions, write what should happen. For example:
A single blue backpack rests on a clean studio surface. The camera makes one slow push-in from a medium shot to a close product view. Keep the backpack shape, zippers, lighting direction, and background stable. End with the backpack centered and still.
This gives the model an observable target. The final sentence can then remove a specific conflict:
No extra products, people, camera orbit, cuts, or new readable text.
This is an illustrative prompt, not a tested result.
When a negative prompt is useful
Use one when the output repeatedly adds a known unwanted element. Keep the instruction tied to the shot:
- Subject drift: “No second person; keep the same subject throughout.”
- Camera conflict: “No orbit, zoom, or angle change; use one slow push-in.”
- Product clutter: “No extra products or hands entering frame.”
- Typography risk: “Add no new text or logos; place exact copy in post-production if it must be readable.”
Do not combine every possible failure in one request. Change one variable between attempts so you can tell what helped.
When to rewrite instead
If the result is chaotic because the brief contains several competing actions, rewrite the positive sequence first. “Keep the camera static” conflicts with “orbit around the subject.” “The subject stops” conflicts with “continues walking.” Resolve those contradictions before adding more exclusions.
If the unwanted detail comes from a reference image, inspect the reference itself. A background object, printed label, or second person may be transferred even when the prompt says not to include it. Crop or replace the source asset when the source is the problem.
A controlled repair loop
- Save the original prompt and settings.
- Identify the first visible failure and its timestamp.
- Change one instruction only.
- Keep model, duration, ratio, and references fixed for the next comparison.
- Review the full exported clip, not only the thumbnail.
- If text or a logo must be exact, finish it in an external editor.
Negative prompts are constraints, not a substitute for a clear scene description. The model, selected mode, references, duration, and source quality still affect the result.
FAQ
Should I put “no” before every sentence?
No. Use normal positive directions and reserve a short negative line for a concrete failure. Too many exclusions can make the brief harder to interpret.
Do negative prompts guarantee no unwanted objects?
No. They can reduce ambiguity but cannot guarantee a clean result. Check the complete clip and simplify the shot if the issue persists.
Are “bad quality” and “ugly” useful negative prompts?
Usually not. Describe the quality you need—stable subject, controlled light, clean framing—and name the specific thing that must not change.
Is this a tested case study?
No. The examples are illustrative. A real case study would require the source asset, exact settings, generated output, and review notes.
