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---
title: "负向提示词"
type: concept
tags: [ai, prompt, image-generation]
---
## Definition
负向提示词Negative Prompt是一种明确指定 AI 生成过程中需要排除的特征或元素的提示词策略。
## Mechanism
在图像生成中negatives 字段告诉模型"不要生成这些内容"
- 避免常见缺陷blur、noise、watermark、logo
- 排除不需要的元素human hands、text、distortion
- 控制风格纯度no unrealistic lighting、no cartoon style
## In Nano Banana Framework
Nano Banana 的 negatives 字段是质量控制关键:
```json
"negatives": "no scratches, no dust, no logos or brand names, no human hands, blurry watch face"
```
## Why It Matters
不写 negatives = 让 AI 自由发挥,容易混入不需要的元素。明确的 negatives = 质量门槛。
## Connections
- [[Nano Banana]] ← 框架实现
- [[结构化提示词]] ← 上位概念