description: Art direction for every media.generate_image prompt in a deck, so imagery reads as one consistent visual system.

Image generation directive / 图像生成指令

Every media.generate_image prompt for a deck must be art-directed, not a bare subject, so the
imagery reads as one consistent, magazine-grade visual system instead of random stock. The
palette values (primary, accent, paper) and the deck's image_style come from the
StylePlan you were handed.

幻灯片组的每一个 media.generate_image 提示词都必须经过艺术指导，而不是一个光秃秃的主题词，这样图像才能呈现为一个统一的、杂志级的视觉系统，而不是随机的素材图。配色值（primary、accent、paper）和幻灯片组的 image_style 来自交给你的 StylePlan。

Build each prompt from these parts, in order, then combine them into one sentence. Set
media.generate_image's output_dir to the exact artifact_media_dir string from your contract
(never a bare .src/media/, which would resolve against the home directory), then embed the
result as a data: URI.

按顺序用以下要素构建每个提示词，然后把它们组合成一句话。把 media.generate_image 的 output_dir 设为你的契约中确切的 artifact_media_dir 字符串（绝不要用裸的 .src/media/，那会相对主目录解析），然后把结果作为 data: URI 嵌入。

Medium: pick the one that fits the deck and keep it consistent across every slide:
polished editorial photography for real-world or business topics (pitch, QBR, travel,
product, food, real estate); a single illustration style (flat vector, watercolor,
isometric, or 3D render, choose one) for playful, kids, gaming, wellness, or conceptual
topics. Honor the deck's mood: the StylePlan.image_style line.

媒介（Medium）：挑选适合该幻灯片组的一种，并在每张幻灯片上保持一致：现实或商业主题（融资演讲、QBR、旅行、产品、美食、房地产）使用精致的编辑摄影；活泼、儿童、游戏、健康或概念性主题使用单一插画风格（平面矢量、水彩、等轴测或 3D 渲染，选择其一）。遵循幻灯片组的情绪基调：即 StylePlan.image_style 一行。
Subject: the slide's concrete subject. For a how-to, educational, or concept slide,
the image must clearly demonstrate that specific concept (an actual photo exhibiting
"leading lines" or "rule of thirds", not a generic related scene) so the slide teaches at a
glance.

主题（Subject）：幻灯片的具体主题。对于教程类、教学类或概念类幻灯片，图像必须清楚地展示该具体概念（一张真正体现"引导线"或"三分法"的照片，而不是泛泛的相关场景），让幻灯片一目了然地完成讲解。
Composition: decide the image's role first, because it sets the framing:

构图（Composition）：先决定图像的角色，因为它决定了取景方式：
- Full-bleed / hero (cover, section, statement, closing, or full-screen image slide
  where the title/text overlays the photo): keep the subject and visual detail to one
  side or the upper area and leave large, calm, low-detail negative space along at
  least one side and the lower edge (the usual title zones) so the overlaid title reads
  cleanly. Rule-of-thirds; never a busy subject dead-center where a title lands.
  
  满版/主视觉（Full-bleed / hero）（封面、章节、宣言、结尾或全屏图像幻灯片，标题/文字叠加在照片上）：把主体和视觉细节放在一侧或上部，沿至少一侧和下缘（通常是标题区）留出大面积、平静、细节稀少的负空间，使叠加的标题清晰可读。遵循三分法；绝不在标题落点处以正中位置放置繁杂主体。
- Content / cell (fills a two-column half, a bento/gallery cell, or a lockup image
  column, where the text sits in a separate panel beside the image): do the opposite,
  fill the frame with the subject, prominent and roughly centered, and do not reserve
  empty negative space. No text overlays it, so reserved space just crops into the cell as
  dead space; a tightly-composed, subject-filling frame crops cleanly under object-fit:cover.
  
  内容/单元格（Content / cell）（填充双栏的一半、bento/画廊单元格或组合图列，文字位于图像旁边的独立面板中）：做法相反，让主体充满画面，突出且大致居中，不要预留空白负空间。没有文字叠加在它上面，预留的空间只会成为单元格里的死角；构图紧凑、主体充满的画面在 object-fit:cover 裁切下效果干净。
Color and value: grade the image toward the palette (primary, accent) so it
harmonizes, but keep a clear, well-exposed focal subject with strong contrast and tonal
depth. Never wash the image out: no foggy, hazy, overexposed, blown-out, near-white,
milky, flat, or low-contrast results, and never let the subject fade into the background.
Match the image's brightness family to the slide background (rich low-key on a dark slide;
bright with real tonal depth on a light slide), but a visible high-contrast subject always
wins over blending. Avoid colors that clash with the palette.

色彩与明暗（Color and value）：让图像向配色（primary、accent）调色以保持和谐，但要保持清晰、曝光良好的焦点主体，具有强对比和影调深度。绝不要把图像洗白：不要出现雾蒙蒙、朦胧、过曝、死白、接近白色、奶白、平淡或低对比的效果，绝不让主体淡入背景。使图像的明暗基调与幻灯片背景匹配（深色幻灯片用浓郁的低调影调；浅色幻灯片用明亮且有真实影调深度的画面），但清晰可见的高对比主体永远优先于融合。避免使用与配色冲突的颜色。
Quality: polished, never a generic stock look. Photography: soft
intentional lighting, shallow depth of field, fine detail, sharp focus. Illustration: clean
shapes, consistent line weight, balanced layout. Request a high-resolution image (long
edge ≥1536px) that stays crisp filling a full-bleed slide, never soft, blurry, upscaled,
pixelated, or low-detail. A sourced photo meets the same bar: verify the downloaded
file's pixel size (gm identify), and a candidate below that long-edge floor is rejected
for hero or full-bleed use rather than upscaled.

质量（Quality）：精致，绝不要平庸的素材图观感。摄影：柔和而有意图的布光、浅景深、细节丰富、对焦锐利。插画：形状干净、线宽一致、布局均衡。请求高分辨率图像（长边 ≥1536px），在铺满满版幻灯片时依然清晰，绝不发软、模糊、放大凑数、像素化或细节不足。检索来源的照片要达到同样标准：验证下载文件的像素尺寸（gm identify），长边低于该下限的候选图直接弃用于主视觉或满版用途，而不是放大凑数。
Aspect ratio: request the panel's ratio: tall/portrait for a side panel, 16:9 for a
full-bleed cover, so the image fills its container under object-fit:cover with minimal
cropping.

宽高比（Aspect ratio）：按面板的宽高比请求：侧栏用竖幅，满版封面用 16:9，使图像在 object-fit:cover 下以最小裁切填满容器。
Exclusions: no text, letters, numbers, equations, formulas, axis labels, legends,
captions, watermarks, logos, dashboards, or UI in the image (render charts with the
matplotlib path and any labels as styled HTML instead); no clutter in the text zone.

排除项（Exclusions）：图像中不出现文字、字母、数字、等式、公式、坐标轴标签、图例、说明文字、水印、徽标、仪表盘或 UI（图表改用 matplotlib 路径渲染，标签用带样式的 HTML 呈现）；文字区内不留杂乱元素。

Examples / 示例

Hero (title overlays the photo, so leave negative space):
主视觉（Hero）（标题叠加在照片上，因此要留负空间）：

editorial photograph of a misty mountain lake at dawn, subject in the upper-right third with
calm empty water and sky in the lower-left for the title, soft golden side light, muted
palette grading toward the deck's paper tone, shallow depth of field, fine detail, 16:9

一张黎明时分薄雾笼罩的山间湖泊的编辑风摄影照片，主体位于右上三分区，左下留出平静空旷的水面和天空用于放置标题，柔和的金色侧光，调色偏向幻灯片组的纸色调，浅景深，细节丰富，16:9

Content cell (text sits beside it, so fill the frame):
内容单元格（Content cell）（文字位于图像旁边，因此要充满画面）：

editorial photograph of a golden retriever puppy in a sunlit meadow, subject filling the
frame and centered, soft natural light, shallow depth of field, fine detail, tall 4:5
portrait for a side column

一张阳光照耀的草地上金毛幼犬的编辑风摄影照片，主体充满画面且居中，柔和的自然光，浅景深，细节丰富，供侧栏使用的 4:5 竖幅

When to generate / 何时生成

Generate the cover hero by default when its subject depicts nothing real; when the cover subject
is a real thing (a company, product, place, or person), source it with the image-search skill
instead. Generate content images where they illustrate a concept (see authoring.md → Images). Metric, statement, and financial slides stay typographic /
data-driven; do not generate an image just to raise the count.

当封面主视觉的主体不描绘任何真实事物时，默认使用生成；当封面主体是真实事物（公司、产品、地点或人物）时，改用 image-search 技能获取。在内容图像用来说明概念之处生成它们（参见 authoring.md → Images）。指标页、宣言页和财务页保持排版/数据驱动；不要为了凑数量而生成图像。

【评论】排除条款要求生成图像中不出现任何文字与 UI，是对图像生成模型易产生乱码文字这一常见缺陷的针对性规避；真实事物改用图片检索则是可用性与事实准确性的折中。