如何為 Grok Image 撰寫提示詞

最重要的規則

1. 1

   以主體句開頭

   「一個霧面鼠尾草綠的陶瓷手沖濾杯,放在半滿咖啡的玻璃壺上,置於淺橡木檯面上,背景是白色方形瓷磚。」如果以氛圍、底片類型或避免清單開頭,主體就會變成配角。

2. 2

   精確說出每個物件,並標明數量

   要說「一個棕褐色皮革郵差包」,而不是「一個包包」;「一個琺瑯鑄鐵平底鍋」,而不是「一個器皿」;「兩個濃縮咖啡杯」。Grok 會畫出你指名的物件。

3. 3

   讓光線亮到足以看清楚

   為光線指定光源、方向和硬度:「來自左側窗戶的柔和光線,明亮而溫暖」。像「曝光不足」這樣的詞會讓主體變暗。

4. 4

   編輯時先寫要改的地方

   「將金屬錶帶換成棕色皮革錶帶。保持相同的手腕、相同的角度和相同的桌面。」如果編輯一開頭就寫「保持一切不變」,畫面幾乎不會有變化。

5. 5

   先檢查,再修正一件事

   如果主體不對，請修改主體句後重新生成。如果只有一兩處細節不對，請上傳結果圖，只編輯那些細節。

可以參考的提示詞

• 產品照

  A pair of white leather low-top sneakers with gum rubber soles, shot from a low three-quarter angle. The laces are loosely tied, the toe boxes show soft creases, and the left shoe sits slightly ahead of the right. They stand on pale gray concrete against a warm off-white wall. Hard morning sun from the right casts long, sharp shadows, with soft fill on the shaded side. 50mm product photograph from a low three-quarter angle, both shoes sharp, cropped just above the heel tabs.

  為什麼有效: 主體以精確的形態放在最前面，角度用相同的字句說兩次，光線則有光源、方向和軟硬。適合搭配 3:2 的長寬比。

• 工作中的人像

  A woman in her sixties with short silver hair and reading glasses pushed up on her head, laughing while she pots a small olive tree at a wooden workbench. Her hands are dusted with dark soil and her sleeves are rolled to the elbow. Terracotta pots and a steel trowel sit on the bench beside her. Soft window light from the left, bright and warm, with gentle shadows. 35mm photograph at eye level, framed from the waist up, her face in sharp focus.

  為什麼有效: 用看得見的事實取代形容詞（眼鏡、泥土、捲起的袖子），再加上兩件有名稱的道具，就能寫出一個你指得出來的人。試試 2:3 的長寬比。

• 填滿畫面的美食

  A vegetarian Greek salad in a warm cream ceramic bowl, shot from a slight overhead angle. Cucumber, tomato, thick red onion, irregular feta crumbles, and wrinkled black olives overlap in olive oil, with oregano on the tomatoes. The bowl sits on butter-yellow linen over terracotta; a warm pita is partly visible at the right edge and a fork rests on the rim. Hard summer sun and on-camera flash, bright and vivid, with warm shadows. 35mm photograph from a slight overhead angle, the food filling the bowl, one frame.

  為什麼有效: 每種食材都以呈現的形態命名，明亮而強烈的光線讓主體一目了然。請使用 4:3。

• 先寫修改內容的編輯

  Replace the metal watch strap with a brown leather strap with cream stitching. Keep the same wrist, the same shirt cuff, the same angle, and the same desk.

  為什麼有效: 上傳照片，並把長寬比設成與照片相同。先寫要改的地方，最後用一句話讓其他部分保持不變。

• 風格轉換

  Render this as a pencil sketch with detailed cross-hatched shading on off-white paper. Keep the same people, poses, and framing.

  為什麼有效: 上傳照片。風格轉換要先描述你想要的樣貌，再保留主體與版面。