95 lines
3.6 KiB
Markdown
95 lines
3.6 KiB
Markdown
---
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title: "物件描述框架"
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type: concept
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tags: [prompt, image-generation, nano-banana, structure]
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---
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# 物件描述框架（Object Description Framework）
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Nano Banana 提示词框架中用于描述物品的结构化字段体系，与人物描述框架共用同一结构，区别在 subject 字段内容。
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## 字段定义
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```json
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{
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"shot": "", // 镜头类型和构图
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"subject": {
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"item": "", // 物品名称
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"materials": "", // 材质
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"details": "", // 细节描述
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"condition": "" // 状态（全新/破损等）
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},
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"environment": "", // 环境背景
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"lighting": "", // 光照设置
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"camera": {
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"focal_length": "", // 焦距
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"aperture": "", // 光圈
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"angle": "" // 角度
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},
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"color_grade": "", // 色彩风格
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"style": "", // 整体风格
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"quality": "", // 质量要求
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"negatives": "" // 负向提示词
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}
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```
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## 与人物描述框架的对比
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| 字段 | 物件框架 | 人物框架 |
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|------|----------|----------|
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| subject.item | 物品名称 | - |
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| subject.age | - | 年龄 |
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| subject.materials | 材质 | - |
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| subject.appearance | - | 外貌 |
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| subject.details | 细节 | - |
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| subject.pose | - | 姿态 |
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| subject.condition | 状态 | - |
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核心结构一致，subject 字段内容因描述对象而异。
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## 关键能力
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### 负向提示词（Negatives）
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控制生成质量，明确排除不需要的特征：
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```json
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"negatives": "no scratches, no dust, no logos or brand names, no human hands, blurry watch face, unrealistic lighting."
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```
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### 运镜控制（Camera）
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实现电影级构图：
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- focal_length：焦距（100mm macro look = 微距效果）
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- aperture：光圈（f/8 = 整体清晰）
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- angle：角度（45 度俯拍 = 产品摄影标准角度）
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## 实践示例
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手表产品摄影：
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```json
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{
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"shot": "Macro close-up shot, square aspect ratio (1:1), centered composition.",
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"subject": {
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"item": "A luxury men's chronograph watch.",
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"materials": "Polished stainless steel case, sapphire crystal glass, black ceramic bezel with a tachymeter scale, leather strap with fine stitching.",
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"details": "White dial with three sub-dials, glowing lume on hands and hour markers, intricate gears of the movement visible through a transparent caseback.",
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"condition": "Pristine, brand new, no dust or fingerprints."
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},
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"environment": "The watch is resting on a dark, textured slab of slate rock. The background is a simple, dark, out-of-focus gradient.",
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"lighting": "Studio softbox lighting. A key light from the top-left creates clean, sharp reflections on the steel. A soft fill light from the right reveals details in the shadows. A subtle rim light separates the watch from the dark background.",
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"camera": {
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"focal_length": "100mm macro lens look",
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"aperture": "f/8 (to keep the entire watch face in focus)",
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"angle": "Shot from a 45-degree angle above the watch."
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},
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"color_grade": "High contrast, clean and commercial look. Slightly desaturated to emphasize the metallic and monochrome textures. High clarity and sharpness.",
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"style": "Hyper-realistic CGI render, commercial product photography, luxury and precision.",
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"quality": "8K resolution, perfect material shaders, flawless reflections, extreme detail on the dial and gears.",
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"negatives": "no scratches, no dust, no logos or brand names, no human hands, blurry watch face, unrealistic lighting."
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}
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```
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## 相关概念
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- [[Nano Banana]]：物件描述框架的上一层框架
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- [[人物描述框架]]：物件描述框架的姐妹框架
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- [[AI生图]]：物件描述框架的应用领域
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- [[负向提示词]]：质量控制的关键字段 |