Publish date: 2026-09-05
Keywords: Nano Banana, Nano Banana Pro, identity drift, text blur, troubleshooting, Nano Banana official site
Searches like “Nano Banana face drift” or “garbled text” need a fault tree, not another scene tutorial: symptom → cause → prompt fix / whether to switch to Pro. Pair with the prompt pack and Prompt Guide.
1. Stop rerolling: 60-second diagnose
- Identity issue (face swap) or composition issue?
- Text problem or lighting/cutout look?
- Is the reference sharp with a large subject?
- Did you change too many variables at once?
- Are you burning finalize credits on exploration? (credits guide)
2. Failure taxonomy table
| Symptom | Likely cause | First fix |
|---|---|---|
| Identity drift / face swap | Weak/no reference | Clear ref + preserve 100% + Pro |
| Text blur / gibberish | Long baked copy | Short words or blank + overlay |
| Fake light / cutout edges | Unmatched light/shadows | Key direction + contact shadows |
| Logo warp | Unlocked marks | keep label legible; no warped logo |
| Extra limbs | Hard pose + weak negatives | Simplify pose; no extra limbs |
| Series palette drift | Rewriting style each time | Fixed style/palette anchors |
| Local edit goes global | No LOCAL EDIT lock | “change only X” |
3. Identity drift (most common)
- Use a sharper, cleaner reference
- Lock:
preserve the EXACT facial likeness 100%; no face swap - Finalize on Nano Banana Pro
- Change background or wardrobe—not age/hair/ethnicity together
- Reduce heavy stylization (“cartoon / beauty filter”)
4. Text blur and fake paragraphs
- Keep 3–6 word titles—or bake no text
- Leave negative space for real typography later
- Negatives:
no garbled text; no unreadable micro-copy - Prefer Pro when short words must be readable
- See text rules in the Prompt Guide
5. Bad lighting and floating subjects
- Specify key light, e.g.
soft key from camera-left - Require
realistic contact shadowsand shared color temperature - Use local-edit template E1 from the prompt pack
- Avoid contradictory light stacks
- Finalize on Pro; avoid plastic over-smoothing
6. Logo warp and other pits
Logo: preserve logo proportions; keep label legible; no warped logo
Fusion: unified light; no duplicate faces / floating objects
Over-smooth: natural skin texture; no plastic beauty filter
Crowded frames: demand negative space for later type
7. Printable repair checklist
- Reference quality OK?
- Identity/logo lock lines present?
- One variable per round?
- Text shortened or blanked?
- Light + contact shadows specified?
- Explore on Standard, finalize on Pro?
- Wrong tier? See vs Pro
8. FAQ highlights
Q: Is the model “broken”?
A: Usually prompts/references; Pro lowers odds, doesn’t replace constraints.
Q: Reroll everything?
A: Local issues → edit; structural misses → regenerate.
Q: Credits already burned?
A: Stop gambling; rebuild with this checklist + credits guide.
9. Recommended loop
Fail → map the table → change one constraint → switch to Pro if needed → save as team template. Entries: Nano Banana · Pro · Pricing