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wiki/concepts/物件描述框架.md

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