如何为 Guava 写提示词

最重要的规则

1. 1

   描述整张照片，而不只是主体

   先说明这是哪种照片（杂志人像、随手抓拍的手机照片、影棚产品照），再写主体、地点、光线和镜头。光线和镜头是让画面显得真实的关键。

2. 2

   人物要写得具体

   写明具体年龄（“四十出头”，不要只写“年轻”）、脸型和眼睛、肤色和皮肤质感，以及每件衣物的面料。描述含糊的人物，脸都会长得一样。

3. 3

   要求真实的质感

   可见的毛孔、雀斑、细纹、翘起的碎发、起皱的亚麻、磨损的皮革。像“无瑕”“完美肌肤”这样的词会让皮肤显得像蜡像，修得过度。

4. 4

   给光线一个来源和方向

   左侧窗户射入的柔光、她身后的低角度太阳、头顶一盏裸灯泡。保持一致的光线设定：“阴天却有正午的硬阴影”会让模型困惑。

5. 5

   用 Guava 2 打草稿，用 Guava 2 Pro 出成品

   先用速度更快的 Guava 2 打磨提示词，再用同样的文字在 Guava 2 Pro 上渲染满意的那张。

可参考的提示词

• 一张以假乱真的人像

  Realistic editorial portrait photograph. A 41-year-old Nigerian woman with a heart-shaped face, high cheekbones, wide-set dark brown eyes and deep brown skin with visible pores and a few small moles along her jaw sits on a wooden stool, turned slightly to her left, looking straight into the lens with a calm, faintly amused expression. No makeup apart from a soft matte plum lipstick. Her natural hair is gathered into a high puff, a few loose coils catching the light. She wears a rust-colored linen shirt with the sleeves rolled to the elbow, the fabric creased at the shoulders, and thin gold hoop earrings. Her left forearm rests on her knee; her right hand holds a pair of reading glasses by one arm. Behind her, a plain plaster wall in warm gray. Soft window light from the front-left at about 45 degrees, a gentle shadow falling to the right. Shot on an 85mm lens at f/2.8, chest-up, eye level, shallow depth of field. Natural color, fine grain.

  为什么有效: 它按 Guava 最擅长理解人物的顺序来描述她（人物、脸、皮肤、衣服、姿势、光线、镜头），并写出真实的质感，而不是说“漂亮”或“无瑕”。

• 一张随手抓拍的手机照片

  Candid smartphone photo, slightly tilted, taken across a crowded kitchen table during a family dinner. A grandfather in his late seventies with a white mustache and a checked flannel shirt laughs with his eyes squeezed shut, holding a forkful of noodles halfway to his mouth. Plates of dumplings, a half-empty bottle of orange soda and crumpled napkins crowd the table; a child's arm reaches in from the left edge. Warm overhead light from a single paper lamp, a little harsh, with mild noise in the shadows and a hint of motion blur on his hand. Wide-angle phone lens, everyday snapshot realism.

  为什么有效: 真实的照片总有瑕疵：歪斜的构图、被裁掉的手臂、刺眼的室内灯光和一点模糊，这些都在告诉 Guava 生成抓拍照，而不是影棚照。

• 产品图

  Studio product photograph of a matte black ceramic pour-over coffee dripper resting on a slab of pale travertine, a thin coil of steam rising from it. A 100mm macro view from slightly above shows the fine speckled glaze, the spiral ridges inside the cone and a single drop of coffee hanging from the spout. A small glass carafe sits blurred behind it. One large softbox high on the left, a white reflector card on the right, deep soft shadows. Neutral warm-gray background, crisp detail, no noise. No writing, logos or labels anywhere in the image.

  为什么有效: 材质、布光和镜头都写明了，最后一句还能防止 Guava 在产品上凭空编出一个品牌。

• 你的 Character 换上新装，来到新地点

  @mara sits at a window table in a small Lisbon café, keeping her face, skin tone and shoulder-length auburn hair exactly as in her image. She wears a camel wool blazer over a cream silk blouse and holds a white espresso cup in her right hand, glancing out of the window. Soft overcast daylight from the window on the left, a wall of blue and white tiles behind her, shallow depth of field. Candid editorial photograph, 50mm lens at eye level.

  为什么有效: @handle 带来这张脸，第一句说明哪些保持不变，其余部分只改变服装和场景。请把 @mara 换成你自己的 Character。

• 一张招牌清晰可读的街景照片

  Realistic photograph of a narrow side street in Porto after rain. Above a small bakery hangs a hand-painted wooden sign reading "PADARIA LUZ" in cream serif capitals on a faded green board, and a chalkboard by the door says "Bolo de arroz 1,50 €" in white handwriting. Wet cobblestones reflect the warm shop window; a man in a dark raincoat walks past, slightly blurred. 35mm lens at eye level, soft overcast light.

  为什么有效: 每段文字都连同载体、颜色和位置逐字引用,这样 Guava 就能把它画在该出现的位置上。