# 大海雀素材来源与生成记录

- 日期：2026-11-02（Asia/Shanghai）。
- 制作：BirdGacha / OpenAI ImageGen，内置 image_gen 工具，透明背景。
- 用途：替换同物种的简化 SVG 徽章；旧 SVG 保留为加载失败回退。
- 参考夏羽的眼前白斑、具浅色沟纹的黑喙、短翼和黑白体色；重新创作活鸟插画，不使用标本展柜、岩石、卵或照片背景。
- 生成插画不沿用旧 SVG 的 CC0 声明，也不标为花叔原库贴纸。

## Wiki 参考

- [Wikipedia 物种条目](https://en.wikipedia.org/wiki/Great_auk)。
- [Wikimedia 形态参考](https://commons.wikimedia.org/wiki/File:Great_Auk_(Pinguinis_impennis)_specimen,_Kelvingrove,_Glasgow_-_geograph.org.uk_-_1108249.jpg)：Mike Pennington，2009-01-03，Kelvingrove 标本照片，CC BY-SA 2.0（https://creativecommons.org/licenses/by-sa/2.0/）。
- 参考图作为形态输入，未将原照片或骨架图加入网站静态资源。参考作品权利仍归原作者，不为生成图擅自声明第三方许可。
- 本项目已有 `raphus-cucullatus.png` 仅用于笔触、白边与透明背景风格参考。

## 交付规格

- `pinguinus-impennis.png`：内置工具生成的透明原图，1254×1254。
- `pinguinus-impennis.webp`：高清导出，保留原尺寸，quality 90。
- `pinguinus-impennis-optimized.webp`：卡面与详情展示，640×640，quality 82。
- 两种 WebP 均保持 alpha，alphaQuality 100、effort 6；不裁切或铺底。
- 复现编码：`node analysis_scripts/encode_extinct_bird_art.cjs`。
- 高清导出沿用现有 `-optimized.webp` → `.webp` 逻辑。

## 最终生成提示词

```text
Use case: scientific-educational.
Asset type: production transparent natural-history bird sticker for BirdGacha collectible cards.
Primary request: create ONE original full-body living adult great auk (Pinguinus impennis) in summer plumage, informed by Wikimedia's Kelvingrove specimen photograph and Wikipedia morphology.
Input images: Image 1 is Mike Pennington's great auk specimen photo, anatomical reference ONLY. Do not reproduce its pose exactly, taxidermy, glass case, rock, egg, label or lighting. Image 2 is our existing dodo sticker, style/finish and narrow white outline ONLY, do not copy dodo anatomy.
Subject: dignified living great auk in a fresh three-quarter side profile facing left, upright plump body with smooth dense short glossy charcoal-black plumage on head, throat, back and tiny folded wings; clean creamy-white breast and belly. Distinctive large oval WHITE PATCH between each eye and bill in front of the eye, dark hazel eye. Large long laterally flattened BLACK bill, deep vertical curved pale grooves along both mandibles and gently downcurved tip; clearly an auk bill, not a penguin, duck or puffin bill. Small short wings held close to body (flightless), short black tail, two short dark legs and black-grey broad webbed feet visible. Natural seabird proportions.
Style/medium: exquisite semi-realistic hand-painted natural-history illustration, fine dense feather detail, softly rendered form and natural daylight, same polished painterly shading as dodo reference, clean silhouette readable at 200px. Bird looks alive and alert.
Composition: one isolated bird, entire bill, tail, both feet and all toes visible, 6% clear margins, square artwork, no support objects.
Background: true transparent alpha, neat narrow white die-cut sticker outline around entire bird.
Constraints: no scenery, no rock, no egg, no ground plane, no cast shadow, no text, no label, no card UI, no logo, no watermark, no fake checkerboard, no extra limbs, no orange beak or orange feet.
```