
在社交媒体和广告创意中,一种名为“巨物降临(Giant Objects in Real Cities)”的视觉风格正变得越来越流行。它将一个巨大的、超现实的物体(如一只鲸鱼或一瓶香水)无缝地融入到一个我们熟悉的城市地标中,产生一种强烈的视觉反差和奇观感。今天分享的**“真实场景的超现实合成 (V4.5)”**提示词系统,就是帮你用 AI 批量生产这种电影级 VFX 大片的利器。
核心特征说明
📸 底图锚定:基于一张真实的城市照片生成,强制保留原始建筑和街道,真实感爆棚。 🐋 巨物降临:在天际线后方植入一个巨大的奇幻生物或商业产品。 💡 光影融合:巨物会对城市投射柔和的彩色光线或阴影,实现物理级别的真实互动。 👥 人群互动:在地面增加拍照、指点的人群,提供比例尺参考,让画面更有叙事张力。
关键技术拆解
🔑 核心逻辑:Base Image Anchoring (底图锚定) 合成照片最怕的就是“假”。这套 Prompt 的第一条军规就是“忠于原图”。我们使用 based on image_0.png, retaining the exact real-world architecture 的指令,强制 Midjourney 等模型不要自作聪明地修改原始照片中的建筑结构,确保地标的真实性。
🔑 真实感的来源:Lighting Integration (光影融合) 一个物体是否真实存在,取决于它与环境的光影交互。Prompt 明确要求巨物 casts subtle, soft colored light or shadows onto the rooftops below。想象一下,一只发光的星云鲸鱼飞过,城市屋顶被染上一层淡淡的蓝色荧光——这就是让合成照片瞬间变得可信的魔法细节。
🔑 尺度的感知:Atmospheric Perspective & Crowd Layer 如何体现巨物的“巨大”?
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物理层面:利用空气透视原理,在巨物底部增加
atmospheric haze(大气雾霾),表现其距离和体量。 -
叙事层面:在地面增加
diverse crowd looking up, pointing, holding phones(仰望、指点、拍照的人群)。这些小如蚂蚁的人群是最佳的比例尺,瞬间衬托出天空巨物的压迫感。

实际使用场景与扩展
这套系统具有极高的商业价值:
场景一:城市地标创意摄影(原案例)。在上海中心大厦旁飞过一条赛博朋克龙,在巴黎铁塔上空悬浮一只蒸汽朋克飞艇。 场景二:创意广告/户外营销(扩展思路)。将 {creature_description} 替换为巨型产品。例如:“一瓶巨大的可口可乐悬浮在时代广场上空,向地面喷洒气泡和光影”。 场景三:节日庆典氛围图(扩展思路)。圣诞节时,生成一个巨大的圣诞老人趴在城市大楼顶上;中秋节时,生成一只巨型玉兔在月亮旁飞过。
这不仅是一张图,而是一个“事件”。它利用了人们对熟悉环境的好奇心,创造了一种极具传播力的视觉奇观。以下是完整的 JSON 协议,上传一张你所在城市的照片,发挥你的想象力,看看天空中会出现什么吧。
| { “template_name”: “Surreal Giant Creature over Real City (Img2Img)”, “template_version”: “4.5.0”, “template_purpose”: “Composites a colossal, friendly fantasy creature into the skyline of a user-uploaded city photo, adding reacting crowds on the ground while preserving the original architecture.”, “applicable_models”: [“Google Gemini NanoBananaPro”, “Midjourney V6”, “Stable Diffusion XL”, “DALL-E 3”], “input_assumptions”: “Requires a realistic city photograph as input (image_0.png).”, “editable_fields”: [ { “field_key”: “{image_aspect_ratio}”, “label_cn”: “图片比例 (Aspect Ratio)”, “description_cn”: “设定最终生成图片的宽高比。默认9:16用于手机竖屏,可根据需要调整。”, “example_values”: [“9:16 (默认)”, “16:9”, “4:3”, “1:1”, “21:9”] }, { “field_key”: “{city_context_description}”, “label_cn”: “城市环境描述 (可选)”, “description_cn”: “补充描述底图城市的氛围、时间或天气。若留空,AI将根据底图自动判断。”, “example_values”: [“”, “繁忙的商业区,黄昏时刻,金色光线”, “雨后的街道,湿润的路面反射光线”, “清晨的薄雾笼罩城市”] }, { “field_key”: “{creature_description}”, “label_cn”: “巨兽外观描述 (可选)”, “description_cn”: “定义天空巨兽的外观。强调奇幻和友好,非恐怖。若留空,AI将随机生成一个奇幻生物。”, “example_values”: [“”, “一只由发光的星云和古老符文构成的巨大鲸鱼”, “由云朵和树木组成的温和森林巨人”, “透明的水母状生物,触须在建筑物间飘荡”, “巨大的机械朋克风格飞艇生物”] }, { “field_key”: “{crowd_reaction_mood}”, “label_cn”: “人群反应氛围”, “description_cn”: “定义地面新增人群对巨兽的整体情绪反应。”, “example_values”: [“敬畏和惊奇 (Awe and wonder)”, “喜悦和庆祝 (Joyful celebration)”, “震惊和拍照 (Stunned and taking photos)”, “平静的好奇 (Peaceful curiosity)”] } ], “generation_constraints”: { “quality”: [“photorealistic”, “8k resolution”, “cinematic lighting”, “detailed textures”, “accurate perspective”], “style”: [“surrealism”, “magical realism”, “documentary photograph style”], “negative”: [“horror”, “violence”, “destruction”, “monstrous”, “blurry”, “cartoon”, “low quality”, “distorted buildings”] }, “final_image_prompt”: “A photorealistic composite image based on image_0.png, retaining the exact real-world architecture, streets, and vehicles of the original city photo. The scene is enhanced with {city_context_description}. Dominating the sky above and behind the skyline is a colossal, fantastical behemoth, {creature_description} (if empty: generate a random, massive, non-threatening fantasy creature like a glowing nebula-whale or cloud-giant). The creature is positioned behind the furthest skyscrapers, clearly silhouetted against the sky, with immense scale causing atmospheric haze around its lower sections. It casts subtle, soft colored light or shadows onto the rooftops below, integrating realistically into the scene’s lighting without altering the buildings’ structures. On the ground level streets and rooftops, a diverse crowd of additional people has gathered, looking up with expressions of {crowd_reaction_mood}. Individuals are pointing, holding up phones to take photos, smiling, or watching in stunned silence, showing varied reactions across the frame. The overall mood is surreal, breathtaking, and wondrous. Aspect Ratio: {image_aspect_ratio}.” } |