IMAGEN 4 ULTRA COMPLETE PROMPT LIBRARY
使用路由：google/imagen-4-ultra（第三方平台名稱可能不同）
Google Vertex AI 原廠模型 ID：imagen-4.0-ultra-generate-001
版本日期：2026-08-30

模型定位
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適合從文字建立高品質 1K／2K 原始圖：產品視覺、建築、空間、汽車、材質、食物、人物與廣告概念。
重要限制：Google 官方模型表列出 Imagen 4 Ultra 不支援參考圖編修、產品／人物自訂、風格轉移、遮罩修改、插入／移除物件、擴圖與排除提示。需要保持真實 SKU 或原人物時，應改用 GPT Image 2、FLUX.2、Nano Banana Pro 或 Seedream 編修工作流。

官方參數
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model：imagen-4.0-ultra-generate-001
imageSize：1K 或 2K
aspectRatio：1:1、3:4、4:3、9:16、16:9
numberOfImages：1–4
personGeneration：dont_allow、allow_adult、allow_all（部分地區不允許 allow_all）
Prompt 上限：480 tokens
主要 Prompt 語言：英文；繁體中文屬 preview 支援，重要製作仍建議比較英文版。

Prompt 核心規則
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1. 公式：Subject + Context / Background + Style。
2. 第一輪先確立核心概念；後續只增加有意義的材質、光線、鏡位與版面細節。
3. Prompt 描述想看到的完整結果；不要加入 Negative Prompt 清單。
4. 這是文字生圖；品牌 Logo、真實包裝與精確車型不可只靠文字想像當成正式商品圖。
5. 文字保持短而大；長文案與法律標示後製完成。

通用 Master Template
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A [STYLE / MEDIUM] image of [SUBJECT] [ACTION OR STATE] in [CONTEXT AND BACKGROUND]. [SHOT SIZE], [CAMERA ANGLE], [LENS PERSPECTIVE], [SUBJECT PLACEMENT AND COPY SPACE]. [TIME AND WEATHER]. [KEY LIGHT, FILL AND PRACTICALS]. [MATERIALS, TEXTURES, REFLECTIONS AND SCALE CUES]. [COLOR PALETTE]. [INTENDED COMMERCIAL USE], refined and physically coherent.

01｜高級保養品概念渲染
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A photorealistic luxury skincare product concept: a single cylindrical frosted-glass serum bottle with a brushed champagne-metal cap and a minimal ivory paper label, standing on honed travertine. Three-quarter front product view with an 85mm commercial photography perspective, centered-right with generous headline space at upper left. Large diffused key light from rear-left, soft frontal fill, controlled translucent glass refraction, realistic paper fibers, subtle micro-scratches and one grounded contact shadow. Warm ivory, sandstone and champagne palette, premium beauty campaign, refined natural retouching.

設定：3:4、2K、numberOfImages=4。

02｜透明與反射材質研究
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A high-end industrial design visualization of a clear borosilicate glass carafe beside a polished stainless-steel cup on a dark basalt surface. Eye-level close product composition, 70mm perspective, both objects fully visible and physically separated. One broad window-shaped light reveals glass thickness and liquid refraction; a narrow strip light defines the metal curvature. Reflections correspond exactly to the visible studio environment, with realistic caustics, surface condensation and contact shadows. Restrained black, silver and clear-water palette, engineering-grade material realism.

設定：4:3、2K。

03｜現代建築外觀
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A photorealistic architectural visualization of a physically buildable eight-story urban hotel with a terracotta-rainscreen façade, recessed balconies, low-iron glass and a planted public courtyard. Three-quarter street-level view, controlled 28mm perspective, straight verticals, realistic neighboring buildings and a small number of adult pedestrians for scale. Late-afternoon sunlight from the west with cool sky fill, accurate window reflections, coherent façade joints, drainage, railings, entrances and accessible pathways. Warm terracotta, pale concrete and muted greenery, investor presentation cover, 16:9 visual hierarchy.

設定：16:9、2K。

04｜精品飯店大廳
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A photorealistic boutique hotel lobby designed with honed limestone flooring, dark walnut wall panels, textured linen seating and a sculptural reception desk. Wide symmetrical eye-level composition using a controlled 24mm architectural lens perspective, clear arrival and circulation path, intimate seating zones and generous upper-right copy space. Warm 2700K pendant lights balanced with blue-hour window ambience, physically accurate reflections, visible stone pores, wood grain and upholstery weave. Two anonymous adult guests interact naturally at a realistic scale. Quiet, welcoming luxury for a hotel booking homepage.

設定：16:9、2K；personGeneration=allow_adult。

05｜汽車概念廣告
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A photorealistic premium electric grand-touring concept car in deep graphite blue, parked on a broad coastal overlook at blue hour. Three-quarter front hero angle, camera at headlight height, 50mm perspective, elegant long-wheelbase proportions, circular aligned wheels and realistic tire contact. Soft strip lighting traces the shoulder line; cool sky reflections follow the body curvature; headlamp details remain mechanically plausible. Empty road, subdued ocean horizon, left-side headline safe area, precise commercial automotive photography with restrained contrast.

設定：16:9、2K。

06｜工業設備產品視覺
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A photorealistic commercial visualization of a compact modular robotic arm for a clean electronics assembly line. The arm has matte white powder-coated panels, dark graphite joints, visible fasteners, cable routing and a simple safety-status light. Three-quarter eye-level view, 50mm industrial photography perspective, equipment centered-left with technical annotation space on the right. Bright diffuse factory lighting, realistic aluminum worktable reflections, grounded base plate and coherent mechanical clearances. Clean operational environment, precise engineering scale, white, graphite and safety-blue palette.

設定：4:3、2K。

07｜餐飲 Hero Shot
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A photorealistic editorial food photograph of a bowl of Taiwanese beef noodle soup with verified ingredients: braised beef pieces, wheat noodles, bok choy and chopped scallion in a dark ceramic bowl. Three-quarter overhead view, 70mm food photography perspective, bowl slightly lower-left with menu copy space upper-right. Soft window light from the left, warm restaurant ambient fill, realistic steam from the broth, natural oil highlights, visible noodle texture and believable portion size. Dark walnut tabletop, restrained garnishing, rich but accurate food color.

設定：3:4、2K。

08｜成熟商業人物肖像
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A photorealistic editorial portrait of a fictional adult East Asian executive in their early 50s, wearing a tailored navy wool jacket over a soft gray knit top, standing in a quiet contemporary office. Medium shot, eye-level 70mm perspective, subject on the left third with calm copy space on the right. Diffused window light from camera-left, gentle neutral fill and a small catchlight matching the key. Authentic age lines, natural pores, individual hair strands, visible wool weave, relaxed shoulders and supported hands. Credible, warm and composed corporate photography.

設定：3:4、2K；personGeneration=allow_adult。

09｜美妝社群海報
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A polished 4:5 beauty campaign concept featuring one ivory moisturizer jar on a translucent pale-pink acrylic pedestal, surrounded by three restrained water droplets and a single white camellia. Front three-quarter product view with a 70mm lens perspective, product centered in the lower half, ample clean space above. Soft radiant beauty lighting with accurate acrylic refraction and a natural contact shadow. Large headline "RADIANT CALM" appears once at the top in elegant dark rose sans-serif typography. Ivory, blush #E9C7C8 and burgundy #6C2738 palette, premium social advertisement.

設定：3:4 最接近 4:5，2K；正式上稿再裁切與人工校字。

10｜自然景觀品牌情境
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A photorealistic wide landscape of a sustainable mountain lodge integrated into a misty cedar forest after light rain. Low eye-level 35mm architectural landscape perspective, lodge on the lower-left third and layered forest depth extending right. Soft overcast morning light, wet timber cladding, stone foundation, subtle chimney vapor and physically consistent reflections on the path. Small adult hikers provide scale. Muted cedar green, wet stone gray and warm window amber, calm environmental brand storytelling for a 16:9 website hero.

設定：16:9、2K；personGeneration=allow_adult。

11｜珠寶微距概念照
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A photorealistic macro-style commercial photograph of a sculptural platinum ring with a single oval-cut clear gemstone, placed on charcoal silk. Close three-quarter view, 100mm macro perspective, ring centered with its full circular geometry readable. One small hard source creates controlled gemstone facets while a broad soft fill reveals polished platinum curvature. Accurate refraction, crisp prongs, fine silk fibers, subtle contact pressure and restrained sparkle. Deep charcoal and cool silver palette, luxury catalog image, 1:1.

設定：1:1、2K。

12｜建築方案四款探索
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Generate four distinct but physically buildable façade concepts for the same six-story corner retail building. Keep the same site footprint, floor count, structural grid, window positions, entrances and street context. Variant direction: contemporary warm-climate architecture using deep shading, durable low-maintenance materials and accessible ground-floor circulation. Each result is a three-quarter street-level view with straight verticals, soft overcast daylight and the same camera position. Explore material strategy rather than changing the building massing.

設定：4:3、1K、numberOfImages=4。此為概念探索，不能當成已核准設計或完工照片。

失敗修復
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材質像塑膠：加入表面粗糙度、微刮痕、接縫、折射、接觸陰影與單一主光方向。
空間不合理：加入 physically buildable、clear circulation、straight verticals、coherent joints and scale cues。
文字錯誤：縮短成單一大標題；正式文字與 Logo 後製置入。
想保持真實商品卻漂移：停止用 Imagen 文字重畫，改用支援參考圖編修的模型。
Prompt 過長：回到 Subject + Context + Style，再只加攝影與材質的必要資訊，保持 480 tokens 內。

商業 QA
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[ ] model 使用 imagen-4.0-ultra-generate-001
[ ] imageSize、aspectRatio、numberOfImages、personGeneration 設定正確
[ ] 沒有把 Negative Prompt 或參考圖編修當成支援功能
[ ] 概念產品、車輛、建築清楚標示概念示意
[ ] 文字、Logo、價格與法規標示由人工／後製完成
[ ] 建築尺度、通道、結構與材質物理合理

Google 官方參考
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https://ai.google.dev/gemini-api/docs/imagen
https://docs.cloud.google.com/vertex-ai/generative-ai/docs/models/imagen/4-0-generate
https://docs.cloud.google.com/vertex-ai/generative-ai/docs/image/set-output-resolution

