Nano Banana Pro使用JSON提示

JSON 提示是一种为模型提供结构化信息的方法。它们充当模板，使输出更具可重复性。人们通常不会手动或从头开始编写 JSON 提示，而是会使用工具（例如语言模型）来构建模板，然后调整细节。这些模板随后成为创建主题变体的强大工具。

Nano Banana Pro 能够解析极简的提示。如果您要求拍摄狗的照片，您会发现它们各不相同但又相似。通常都很漂亮、温暖、细节丰富、略带质朴和自然。通过使用 JSON 提示，您可以从一开始就更轻松地直接控制主题、风格、构图和光线。您无需记住要定义的内容。这有助于避免使用默认值，并获得您想要的效果。

不一定非得是 JSON 格式。任何结构化数据都可以，我个人比较喜欢用 YAML。不过，社区普遍倾向于使用 JSON。

1、何时应该使用 JSON

我建议在以下情况下使用 JSON：

提示信息较长或较为复杂
想要在保持整体风格不变的情况下更改细节
想要通过显式定义大部分细节来摆脱默认样式
有一个想要用作基础的 JSON 模板
想要模仿现有的图像或输出

2、您的第一个 JSON 提示

这里有一个模板供您参考，它避免了模型的许多默认设置，并展示了能够获得良好效果的保真度水平。

本模板定义了以下几个部分：

主体：人口统计信息、面部特征、头发、身材、姿势和态度
背景：颜色、纹理和景深
风格：媒介、艺术参考、调色板
技术：相机、分辨率
光线：类型、光源、细节
后期处理：风格、调色
限制：保留哪些元素，避免哪些元素

{
  "subject": {
    "demographics": {
      "age": "Early 20s",
      "gender": "Female"
    },
    "face": {
      "skin": {
        "tone": "Fair, porcelain complexion",
        "texture": "Smooth, high-end commercial retouch finish, soft natural blush on cheeks",
        "details": "Subtle nose contour, soft highlights on forehead and chin"
      },
      "eyes": {
        "color": "Striking blue-grey",
        "gaze_direction": "Looking upwards and slightly to the left",
        "makeup": "Defined upper lashes (mascara), subtle eyeliner, natural look",
        "eyebrows": "Thick, dark brown, well-groomed but natural arch, distinct individual hairs visible"
      },
      "mouth": {
        "shape": "Soft, relaxed",
        "color": "Natural pinkish-rose",
        "expression": "Neutral to slightly contemplative/whimsical"
      }
    },
    "hair": {
      "style": "Messy high bun/updo",
      "color": "Dark brown/brunette",
      "texture": "Fine but voluminous",
      "details": "Numerous loose flyaways and wisps framing the face and crown, chaotic but aesthetic 'bedhead' look"
    },
    "pose": {
      "head_position": "Front-facing",
      "body_position": "Shoulders slightly angled, arms crossed",
      "energy": "Casual, thinking, daydreaming"
    }
  },
  "attire": {
    "top": {
      "item": "Chunky knit sweater",
      "color": "Heather grey",
      "texture": "Heavy wool or cotton yarn, visible ribbed collar pattern, soft tactile fuzz",
      "fit": "Oversized, cozy"
    }
  },
  "photography": {
    "style": "High-key studio portrait",
    "shot_scale": "Medium close-up (chest up)",
    "lighting": {
      "type": "Soft, diffuse studio lighting",
      "source": "Large softbox frontal/overhead",
      "details": "Prominent catchlights in upper pupils, soft shadowing under the chin and nose, even illumination"
    },
    "camera_gear": {
      "lens": "85mm Portrait Lens",
      "aperture": "f/2.8",
      "focus": "Sharp focus on eyes and eyebrows, slight fall-off on shoulders and hair edges"
    },
    "post_processing": {
      "look": "Commercial clean aesthetic",
      "grading": "Neutral cool tones, true-to-life colors with slight saturation boost in eyes and lips"
    }
  },
  "background": {
    "type": "Studio backdrop",
    "color": "Solid light grey",
    "texture": "Smooth, featureless",
    "depth": "Flat, non-distracting"
  },
  "aesthetic_fidelity": {
    "medium": "Digital Photography",
    "vibe": "Minimalist, clean, cozy, introspection",
    "visual_qualities": [
      "High resolution",
      "Sharp details",
      "Soft color palette",
      "Textural contrast (smooth skin vs. rough knit)"
    ]
  },
  "constraints": {
    "must_keep": [
      "Upward gaze",
      "Messy hair flyaways",
      "Grey knit texture",
      "Blue eye color",
      "Studio grey background"
    ],
    "avoid": [
      "Smiling with teeth",
      "Direct eye contact with camera",
      "Complex background",
      "Harsh shadows",
      "Jewelry",
      "Glasses"
    ]
  },
  "negative_prompt": [
    "teeth",
    "smile",
    "looking at camera",
    "dark background",
    "patterned background",
    "jewelry",
    "earrings",
    "glasses",
    "low resolution",
    "blurry eyes",
    "overexposed",
    "heavy makeup",
    "red lipstick",
    "straight hair",
    "flat hair"
  ]
}

2、图像转 JSON

获取初始 JSON 提示的最简单方法是使用图像作为参考。我使用 Gemini 3 Pro 生成 JSON 提示，因为它（目前）拥有最佳的图像识别能力。

以下是我使用的系统指令。在 [在此处插入您的示例提示] 处，您可以使用上面的模板提示。

系统提示：

You are an expert prompt engineer for Nano Banana Pro.
Your task is to convert the user's description into a sophisticated, EXTREMELY DETAILED JSON prompt.
You must output a single valid JSON object.

### JSON STRUCTURE GUIDELINES:
1. **Dynamic Fields**: You are encouraged to ADD new fields that capture specific details about the subject (e.g., "plating_style" for food, "architecture_era" for buildings, "glitch_patterns" for abstract art).
2. **Remove Irrelevant Fields**: Do NOT include fields that don't apply. If the subject is a stove, do not include "hair", "skin", or "pose". Remove them entirely rather than setting them to "N/A".
3. **Subject Specificity**:
- **For People**: The example structure (subject, face, skin, hair, clothing) is excellent. Keep it.
- **For Non-Humans**: Create a structure that fits the object. For example, a car might have "chassis", "paint_finish", "wheels".
4. **Standard Fields**: Always include "constraints" (with "must_keep" and "avoid" lists) and "negative_prompt".

### AESTHETIC GOALS:
- **Medium Specificity**: If the user asks for a specific style (e.g. "oil painting"), describe the brushwork, canvas texture, and drying cracks.
- **Lighting**: Be precise (soft, hard, volumetric, golden hour, studio, rim lighting).
- **Camera**: (focal length, depth of field) - ONLY if the style requires photorealism.

Use the following example as a reference for *depth* and *granularity*, but adapt the *keys* to your subject:
[INSERT YOUR SAMPLE PROMPT HERE]

Return ONLY the raw JSON string.

这里有一个示例（输入图像比较复杂）以及最终输出结果。Gemini 3 Pro 生成的用于生成输出的 JSON 代码如下所示。没有传入参考图像。

现在我们得到了：

一个可重用的输入图像 JSON 定义，我们可以对其进行修改并创建各种变体；
一个与原图相似的输出图像，展示了 Gemini 3 Pro 和 Nano Banana Pro 如何出色地捕捉给定图像的精髓。

{
  "subject": {
    "main": "First-person POV hand holding a smartphone",
    "hand_details": {
      "appearance": "Male hand, light skin tone",
      "grip": "Holding an iPhone vertically, thumb hovering near the bottom bezel",
      "lighting": "Illuminated by the screen's glow and warm ambient room light"
    },
    "device": {
      "type": "Modern smartphone with notch (iPhone style)",
      "case": "Black slim case",
      "screen_state": "On, displaying photo gallery app"
    }
  },
  "screen_content": {
    "interface": {
      "app": "iOS Photos App",
      "header": "Time '22:22', Back arrow '< Gallery', Title 'For You'",
      "footer_tabs": "Gallery, For You (selected), Photos, Search"
    },
    "image_grid": {
      "layout": "3-column grid of thumbnails",
      "subject_matter": "Repeated photos of a woman with curly dark shoulder-length hair",
      "attire": "Cobalt blue textured cardigan, white top, beige pants",
      "activity": "Sitting by a window, sketching in a notebook/pad, holding up a drawing",
      "consistency": "Same woman in various poses, some candid, some looking at camera smiling"
    }
  },
  "environment": {
    "setting": "Cozy living room at night",
    "left_side": {
      "furniture": "Tall dark wood bookshelf packed with colorful book spines",
      "lighting": "Small mushroom-style lamp emitting warm yellow light on shelf",
      "decor": "Two plush toys on a side table: A large Snorlax wearing sunglasses and a smaller Eevee"
    },
    "center_right": {
      "electronics": "Large wall-mounted flat screen TV displaying a night cityscape (Hong Kong skyline aesthetic) and digital clock overlay '22:24'",
      "audio": "Black soundbar mounted below TV",
      "furniture": "Wooden media console, wooden coffee table in foreground (out of focus)"
    },
    "foliage": {
      "plant": "Monstera deliciosa leaves visible near the top, backlit by warm light"
    }
  },
  "photography": {
    "style": "POV Lifestyle Snapshot",
    "focus": "Sharp focus on the smartphone screen, shallow depth of field (strong bokeh) on background",
    "lighting": {
      "type": "Low-light indoor ambience",
      "sources": [
        "Warm tungsten lamp on bookshelf",
        "Cool blue light from TV screen",
        "Bright white light from phone display"
      ],
      "contrast": "High contrast between the bright phone screen and the dim, cozy room"
    },
    "camera_gear": {
      "lens": "24mm or 28mm wide angle",
      "aperture": "f/1.8 to f/2.0 (creating background blur)",
      "iso": "High ISO (slight grain visible in shadows)"
    }
  },
  "aesthetic_fidelity": {
    "medium": "Digital Photography",
    "vibe": "Domestic, cozy, tech-focused, intimate evening",
    "visual_qualities": [
      "Realistic screen reflection",
      "Warm color temperature",
      "Soft background blur",
      "Digital noise in dark areas"
    ]
  },
  "constraints": {
    "must_keep": [
      "Snorlax plushie with sunglasses",
      "Eevee plushie",
      "Time on phone 22:22",
      "Grid of photos showing woman in blue cardigan",
      "Cityscape on TV background",
      "Monstera leaves",
      "Warm bookshelf lighting"
    ],
    "avoid": [
      "Daylight",
      "Empty screen",
      "Blurry phone screen",
      "Third-person perspective",
      "Bright overhead lighting",
      "Vector art style"
    ]
  },
  "negative_prompt": [
    "blurry screen",
    "daylight",
    "sunlight",
    "empty room",
    "turned off tv",
    "cartoon filter",
    "illustration",
    "drawing style",
    "messy grid",
    "cracked screen",
    "bright white background",
    "missing plushies",
    "generic landscape on tv"
  ]
}

我们来修改一下这个 JSON 数据，保留整体风格，但把它改成 2000 年代初期的风格。你可以手动修改，也可以使用语言模型自动完成。注意手机、电视和音响的变化：

{
  "subject": {
    "main": "First-person POV hand holding a vintage BlackBerry phone",
    "hand_details": {
      "appearance": "Male hand, light skin tone",
      "grip": "Holding the device with both hands, thumbs resting on the physical QWERTY keyboard",
      "lighting": "Illuminated by the small screen's backlight and warm room ambience"
    },
    "device": {
      "type": "Early 2000s BlackBerry (e.g., model 7230 or 6230)",
      "body": "Bulky blue/black plastic casing with side trackwheel",
      "screen_state": "On, displaying a low-resolution pixelated color interface"
    }
  },
  "screen_content": {
    "interface": {
      "os": "Retro BlackBerry OS",
      "header": "Status bar with battery icon, signal bars, and 'GPRS'",
      "context": "Email/Message inbox open"
    },
    "display_content": {
      "type": "Opened email attachment",
      "image_quality": "Highly pixelated, low-bit color depth (16-bit color)",
      "subject_matter": "A single grainy photo of a woman with curly dark shoulder-length hair",
      "attire": "Cobalt blue textured cardigan, white top",
      "text_overlay": "Sender: 'Sarah' - Subject: 'Me'"
    }
  },
  "environment": {
    "setting": "Cozy living room at night, circa 2003",
    "left_side": {
      "furniture": "Dark wood bookshelf packed with books and CD jewel cases",
      "lighting": "Lava lamp or translucent colored desk lamp emitting warm glow",
      "decor": "Two plush toys on a side table: A large Snorlax wearing sunglasses and a smaller Eevee (Gen 2 Pokémon era appropriate)"
    },
    "center_right": {
      "electronics": "Bulky CRT TV (Sony Trinitron style) displaying a music video channel with scanlines visible",
      "audio": "Silver stereo system with stack of components (CD changer, tape deck)",
      "furniture": "Wooden media console with glass doors, DVD cases visible inside"
    },
    "foliage": {
      "plant": "Monstera deliciosa leaves visible near the top, backlit by warm light"
    }
  },
  "photography": {
    "style": "POV Flash Snapshot / Film Photography",
    "focus": "Sharp focus on the BlackBerry physical keyboard and screen, soft background",
    "lighting": {
      "type": "Indoor tungsten mixed with CRT glow",
      "sources": [
        "Warm lamp on shelf",
        "Flickering blueish glow from CRT TV screen",
        "Small backlight from phone"
      ],
      "contrast": "Medium contrast, nostalgic film grain texture"
    },
    "camera_gear": {
      "lens": "35mm film camera simulation",
      "aperture": "f/2.8",
      "film_stock": "Kodak Gold 400 or Fujifilm Superia (grainy, warm tones)"
    }
  },
  "aesthetic_fidelity": {
    "medium": "Analog Photography scan or Early Digital",
    "vibe": "Nostalgic, Y2K era, tech-focused, intimate evening",
    "visual_qualities": [
      "Film grain",
      "CRT scanlines in background",
      "Plastic textures of old tech",
      "Low dynamic range typical of the era"
    ]
  },
  "constraints": {
    "must_keep": [
      "Snorlax plushie with sunglasses",
      "Eevee plushie",
      "Low-res photo of woman in blue cardigan on screen",
      "CRT TV in background",
      "Physical keyboard on phone",
      "Warm bookshelf lighting"
    ],
    "avoid": [
      "Modern smartphones",
      "Touchscreens",
      "HD flat screen TVs",
      "LED lighting strips",
      "High resolution screen display",
      "Vector art style"
    ]
  },
  "negative_prompt": [
    "iPhone",
    "Android",
    "touchscreen",
    "bezel-less screen",
    "4k tv",
    "modern furniture",
    "clean digital look",
    "illustration",
    "drawing style",
    "cracked screen",
    "bright white background",
    "missing plushies",
    "lcd screen"
  ]
}

4、轻松创建变体

Nano Banana Pro 可以自动为您创建各种变体。只需在提示符前添加更改 JSON 的指令即可：

Generate a new image with SIGNIFICANTLY different nouns, objects, color palette and pose compared to the JSON below. CRITICAL: Strictly preserve the original 'vibe', 'aesthetic', and 'mood'. The result should look like a distinct image from the same artistic series.

[INSERT YOUR JSON PROMPT HERE]

你也可以控制这些变化：

Additional Instruction: [eg Make it night time]

Generate a new image with SIGNIFICANTLY different nouns, objects, color palette and pose compared to the JSON below. CRITICAL: Strictly preserve the original 'vibe', 'aesthetic', and 'mood'. The result should look like a distinct image from the same artistic series.

[INSERT YOUR JSON PROMPT HERE]

以下是使用这些技术生成的同一 JSON 提示的各种变体：

另一组变体，主题不同：

这种方法的缺点在于，您牺牲了提示的准确性来换取提示的多样性。您的提示将无法准确描述您获得的图像。

5、整合所有功能

使用 AI Studio，您可以将所有这些功能整合到一个应用程序中，该应用程序可让您：

从图像生成 JSON 提示
优化 JSON 提示
从 JSON 提示创建变体

您可以在 AI Studio 中运行此应用程序，也可以从 GitHub 获取代码。

点击这里查看应用程序的演示视频。

6、JSON 转散文

你不必非得使用 JSON。对于任何给定的 JSON 提示，都有一个同样适用的散文版本。如果你见过一个不错的 JSON 提示，你可以让语言模型帮你把它转换成散文：

Given this JSON, keep all the details and convert it to prose. Use only paragraphs. Be concise.

以下是一个不使用 JSON 的复杂提示示例：

A portrait photo of david duchovny, he is wearing a PSG kit, on his shoulder is a parthenos sylvia, in his hand he is holding lily of the valley, behind him there is a poster for the movie 'Last Year at Marienbad' and a Garchomp poster. On a plinth there is a jeff koons sculpture. The sky through the window shows lenticular clouds. There is also a Terminator 2 cross-stitch on the wall. On his arm there is a tattoo of a Nissan Qashqai. There's an orange lego Christmas tree. The room has a high end decor, a pot is boiling on the NEFF hob. Next to the pot is a little origami chair made from purple and yellow paper. He has a dangling monstera leaf earring. There is a pet marine iguana. In his other hand he is making the ok shape. On that hand there is a gold ring. The whole image gives the impression of a hastily taken photo, an everyday scene.

7、混合提示

您无需仅使用 JSON 或纯文本格式进行提示。您可以先使用纯文本格式，然后添加 JSON 代码，以便更好地控制输出。

例如，如果您有一个喜欢的 JSON 代码片段，它可以生成特定样式的图像，您可以将其添加到常规提示的末尾。Nano Banana Pro 可以处理它。您的提示无需是有效的 JSON 格式，模型并不关心这一点。

8、结束语

并非所有图像都需要使用 JSON 提示，但如果您有特定的构想或现有的模板，并且拥有合适的工具，它将非常强大。

原文链接：Prompting Nano Banana Pro with JSON

汇智网翻译整理，转载请标明出处