NANO BANANA COMPLETE PROMPT LIBRARY
使用路由：google/nano-banana（第三方平台名稱可能不同）
Google 正式名稱：Gemini 2.5 Flash Image（Nano Banana）
原廠模型代碼：gemini-2.5-flash-image
版本日期：2026-08-30

模型定位
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適合高量、快速、低延遲的視覺發想，以及以對話方式換背景、換顏色、重構社群圖與輕量商業編修。支援文字與圖片輸入、圖片與文字輸出，也支援 Batch API。
注意：本檔是原始 Nano Banana / Gemini 2.5 Flash Image，不自動替換為更新的 Nano Banana 2，也不把它描述成一般擴散模型的量化版。

Prompt 核心規則
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1. 以動詞開頭：Create、Edit、Replace、Combine、Translate、Preserve。
2. 文字生圖公式：Subject + Action + Location / Context + Composition + Style。
3. 圖像編修公式：Reference + Relationship / Operation + New Scenario。
4. 用正向結果描述想看到的畫面，例如 empty street、clean label、single product。
5. 編修時分成 CHANGE 與 PRESERVE；每輪只改一個主要變因。
6. 高量生產用 Batch API 或外部佇列控制，不要把「一次產 100 張」只寫在 Prompt 裡。

通用文字生圖模板
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Create [SUBJECT] [ACTION] in [LOCATION / CONTEXT]. Compose as [SHOT SIZE, ANGLE, SUBJECT POSITION, RATIO]. Use [LIGHT], [COLOR PALETTE] and [MATERIAL DETAILS]. The result is [STYLE / COMMERCIAL PURPOSE] with [KEY QUALITY CONDITIONS].

通用編修模板
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Edit the supplied image.
CHANGE: [ONE PRECISE CHANGE].
PRESERVE: [IDENTITY / PRODUCT / CAMERA / CROP / TEXT / BACKGROUND / LIGHT / OTHER FIXED ELEMENTS].
Match [PERSPECTIVE, SCALE, LIGHT, SHADOW, REFLECTION AND COLOR]. Return one clean commercial result.

01｜快速商品背景變體
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Edit the supplied [PRODUCT] photograph. Replace the current background with a warm ivory seamless studio background #F3EBDD and place the product on a low pale-stone pedestal. Preserve the exact product silhouette, proportions, cap, label, text, color and camera angle. Match one large softbox from upper-left, a gentle frontal fill and a natural contact shadow. Keep the product centered with equal margins, 1:1 e-commerce composition, clean premium catalog finish.

批次做法：保持其餘 Prompt 相同，只替換背景色碼、平台材質與比例。

02｜電商去雜物清理
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Edit the supplied product photo into a clean e-commerce image. Keep the exact product and its label unchanged. Present one centered item on a smooth light-gray background with a soft grounded shadow, crisp silhouette and even studio illumination. Maintain the original viewing angle and material highlights. The final frame contains the single product with generous margins and a calm catalog layout.

03｜服飾換色但保留材質
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Edit the supplied apparel image. Change only the jacket color from [ORIGINAL] to [TARGET COLOR / HEX]. Preserve the adult model’s authorized facial identity, real age, pose, body proportions, hairstyle, expression, garment cut, stitching, buttons, fabric weave, folds, background, lighting, framing and shadow. The new dye color follows the cloth’s highlights and shade naturally, retaining the original wool texture. Return one photorealistic fashion e-commerce image.

04｜人物換到商務場景
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Combine the authorized adult person from Image 1 with the modern office from Image 2. Preserve the person’s facial structure, real age, hairstyle, skin tone and core navy blazer. Place them beside the office window in a relaxed standing pose, looking slightly toward camera. Match Image 2’s window-light direction, white balance, lens perspective and floor contact. Medium portrait, person on the left third, right-side copy space, natural skin texture and professional corporate photography.

05｜社群 4:5 主視覺快速版
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Create a 4:5 social campaign image for [BRAND] featuring [PRODUCT / FICTIONAL ADULT PERSON]. Use a bold simple composition with the subject centered in the lower two-thirds and clean headline space above. Background color [HEX], one contrasting accent [HEX], soft commercial light, readable material texture and mobile-first hierarchy. Render the exact short headline "[EXACT_TEXT]" once in large bold sans-serif type. Keep every other area visually quiet. Deliver a polished draft for human copy and logo review.

06｜餐飲平台封面
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Create a photorealistic 4:5 food-delivery cover of [REAL DISH]. Show the verified ingredients and real portion in the supplied bowl, three-quarter overhead view, centered slightly low with offer-copy space at upper right. Soft daylight from the left, warm ambient fill, realistic steam and appetizing natural color. Preserve believable food texture, plate contact and table scale. Render the short offer "[EXACT_TEXT]" once at upper right in large high-contrast type. Keep the visual direct and readable on a phone screen.

07｜包裝文字在地化
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Edit the supplied package image. Translate only the selected English line "[SOURCE TEXT]" into the exact Traditional Chinese line "[TARGET TEXT]". Place it in the same region with matching baseline, alignment, visual weight, print color, surface curvature and perspective. Preserve the logo, package geometry, all other text, barcode, product color, lighting, background and crop exactly. The new line appears once and remains large enough for character-by-character review.

08｜飯店照片快速整理
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Edit the supplied verified hotel-room photograph for a booking listing. Preserve the actual room geometry, bed type, furniture, windows, bathroom openings, view and camera position. Straighten vertical lines, balance mixed color temperature, gently lift shadow detail, arrange the existing pillows and bed linen neatly, and retain realistic fabric folds and room texture. Keep every real amenity and architectural feature in place. Deliver a bright, truthful 16:9 hospitality photo.

09｜汽車車色變體預覽
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Edit the supplied [YEAR MAKE MODEL] image. Change only the paint color to [COLOR NAME / HEX]. Preserve the exact grille, headlights, wheel design, tires, mirrors, panel lines, badges, trim, camera angle, background, light direction and crop. The new paint responds naturally to sky and environmental reflections across each body panel. Keep wheel geometry circular, tire contact grounded and the result photorealistic. Label internally as a color preview until the manufacturer approves the shade.

10｜簡單資訊圖草稿
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Create a clean 16:9 visual explainer for [AUDIENCE] showing the four steps of [PROCESS]. Use a white background, dark navy headings, accent color [HEX], one simple icon per step and clear left-to-right arrows. Title exactly "[TITLE]". Step labels exactly "[STEP 1]", "[STEP 2]", "[STEP 3]", "[STEP 4]". Each phrase appears once, with generous spacing and presentation-readable type. Use the following verified facts only: [FACT LIST]. Deliver a draft for human subject-matter and text review.

11｜兩張參考圖合成商品情境
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Combine Image 1 and Image 2 into one commercial photograph. Use Image 1 as the exact product source, preserving its geometry, label, material and color. Use Image 2 as the unchanged room, camera view and lighting environment. Place the product on the side table at a believable scale. Match perspective, light direction, white balance, occlusion, reflection and contact shadow. Preserve all fixed architecture and furniture. Produce a seamless 16:9 lifestyle product image that looks captured in the original room.

12｜同圖多輪修復格式
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Edit the current image with one change.

CHANGE
[Example: move the headline 5% lower / change the wall to #D8D2C6 / correct the right hand grip / replace one package line].

PRESERVE
[List every fixed element: subject, identity, product, layout, camera, crop, light, materials, text, background and shadow].

Match the existing image’s perspective, color and texture. Keep all preserved elements visually consistent. Return one corrected version for side-by-side comparison.

大量產圖變體表
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只替換以下欄位，其餘保持固定：
- BACKGROUND_HEX：#F3EBDD / #DDE6F2 / #1D2430 / #DDE8D5
- RATIO：1:1 / 4:5 / 9:16 / 16:9
- LIGHT：soft daylight / hard noon shadow / warm studio / blue-hour ambient
- CHANNEL：marketplace thumbnail / social ad / story cover / website hero
- COPY_SAFE_AREA：top / left / right / bottom

失敗修復
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編修漂移：將 CHANGE 壓縮成一項，PRESERVE 逐項列出。
商品標籤改掉：把 preserve exact label and every readable character 放在前半段，重要包裝最終仍用正式版型後製。
人物不像本人：使用清楚均勻光的授權參考，先固定臉與年齡，再分輪改衣服、姿勢、背景。
畫面太複雜：縮成一主體、一動作、一環境、一主光與一個版位目的。
高量結果不一致：固定模板與輸入圖，將變體欄位結構化並做自動 QA；不要只依賴 seed。

商業 QA
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[ ] model 使用 gemini-2.5-flash-image，確認第三方 alias 實際映射
[ ] 人物參考已授權且為成年人
[ ] 商品／車型／房型與原圖逐項比對
[ ] 批次變體只替換核准欄位
[ ] 文字、數字、價格、Logo 逐字人工校對
[ ] 真實物件與場地沒有被誤導性增添或刪除

Google 官方參考
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https://ai.google.dev/gemini-api/docs/models/gemini-2.5-flash-image
https://ai.google.dev/gemini-api/docs/image-generation

