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用 ByteDance Seedream 4.0 API（经 Segmind）生成 AI 图像。当用户要从文字描述生成营销素材、海报、产品图、概念图、社交媒体配图等高质量图像，且环境配有 SEGMIND_API_KEY 时使用。支持 2K/4K、多比例、单次最多 15 张批量、最多 3 张参考图控风格。不用于：修改/编辑已有图片（用图像编辑类 skill）、视频生成、无 API 环境下的快速配图需求。
Passed 8 of 18 test cases with the skill, and 3 of 18 without it.
and 6 more in the full report
6 fixed4 passed either way12 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 6 test cases the skill fixed. Same model, same prompt, with and without the skill.
我需要一张 1000x400 特殊比例的展架顶部插图，脚本应该设置什么 size 参数？
| Checked | Without skill | With skill |
|---|---|---|
| Sets --size custom when non-standard dimensions are required. | Missed | Passed |
The instructions your model reads when the skill loads.
通过 scripts/generate_image.py 调用 Seedream 4.0 生成专业级图像。
SEGMIND_API_KEY 时不硬试：告知用户去 segmind.com 获取，或改用环境内其他生图 skill必需：图像内容描述。推荐确认：尺寸（默认 2K）、比例（默认 1:1）、数量（默认 1）。
用途 → 参数对照表
| 用途 | size | aspect_ratio | max_images |
|---|---|---|---|
| 社交媒体 | 2K | 1:1 或 9:16 | 1-3 |
| 网页横幅 | 2K | 16:9 或 21:9 | 1 |
| 打印海报 | 4K | 4:3 或自定义 | 1-2 |
| 产品图 | 2K | 3:2 或 4:3 | 3-5 |
| 概念设计 | 2K | 16:9 | 5-10 |
结构：[主题] + [风格] + [细节] + [质量修饰词]，补光照与氛围；需要图内文字时明确指定文字内容与字体风格；建议 200-300 词内。
示例："一只猫" → "A fluffy orange tabby cat on a wooden windowsill, golden hour lighting, cozy interior, warm palette, professional photography, detailed fur texture"。
风格关键词库与更多范式：references/prompt_engineering.md。
test cases passed, vs 3 / 18 without
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