如何为 Grok Image 写提示词

最重要的规则

1. 1

   以主体句开头

   “一个哑光鼠尾草绿的陶瓷手冲滤杯,放在装了半壶咖啡的玻璃咖啡壶上,置于浅橡木台面上,背景是白色方形瓷砖。”如果开头写的是氛围、胶片类型或避免清单,主体就会沦为陪衬。

2. 2

   准确说出每个物体,并写明数量

   是“一个棕褐色皮革挎包”,而不是“一个包”;是“一口搪瓷铸铁煎锅”,而不是“一个器皿”;是“两个浓缩咖啡杯”。你说出什么物体,Grok 就画什么物体。

3. 3

   让光线足够明亮、看得清

   给光线指定光源、方向和软硬:“来自左侧的柔和窗光,明亮而温暖”。像“曝光不足”这样的词会让主体变暗。

4. 4

   编辑时先写要改的地方

   “把金属表带换成棕色皮表带。保持同一只手腕、同一个角度和同一张桌子。”如果编辑一开头就写“保持一切不变”,画面几乎不会有变化。

5. 5

   先检查,再只修一处

   如果主体不对,就把主体句写得更精确,然后重新生成。如果只有一两处细节不对,就上传结果图,只改那几处。

可参考的提示词

• 产品图

  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.

  为什么有效: 先用准确的形态写出主体,角度用同样的话说两次,光线有光源、方向和软硬。3:2 的画幅比例很适合这张图。

• 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.

  为什么有效: 用看得见的事实代替形容词(眼镜、泥土、卷起的袖子),再加上两件有名称的道具,就能写出一个你能指认出来的人。试试 2:3 的画幅比例。

• 占满画面的美食

  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.

  为什么有效: 每种食材都写明了它的形态,明亮的硬光让主体清晰易辨。使用 4:3。

• 先说修改内容的编辑

  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.

  为什么有效: 上传照片,并把画幅比例设置成与照片一致。先写要改的内容,最后用一句话让其他部分保持不变。

• 风格转换

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

  为什么有效: 上传照片。风格转换先描述你想要的外观,再让主体和布局保持不变。