小熊猫案例素材与许可 / Case image attribution and license

Source photograph: Red panda at Chester Zoo 3.jpg
Photograph by Mike Peel (www.mikepeel.net).
Author website: https://www.mikepeel.net/
Source page: https://commons.wikimedia.org/wiki/File:Red_panda_at_Chester_Zoo_3.jpg
Source image: https://upload.wikimedia.org/wikipedia/commons/8/87/Red_panda_at_Chester_Zoo_3.jpg
License: Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
License link: https://creativecommons.org/licenses/by-sa/4.0/

Modifications / 修改说明
The public JPEG photograph was resized from 5184 × 3456 to 1296 × 864 and converted to PNG with normal lossless PNG encoding (Pillow compress_level=6). This derived PNG is panda-original.png: the baseline of this comparison. The photographic JPEG file size is NOT the compression baseline.
公开 JPEG 摄影作品从 5184 × 3456 缩小为 1296 × 864，采用正常无损 PNG 编码（Pillow compress_level=6）制作 panda-original.png。压缩前体积指这个派生 PNG，不是摄影原始 JPEG 的体积。

panda-compressed.png was generated by the project's unmodified encodeSmartPng function using UPNG.js 2.1.0, up to 256 colors, followed by @jsquash/oxipng 2.3.0 level 2. Color quantization is lossy; the dimensions remain 1296 × 864. Neither comparison image was additionally blurred or enhanced for the design.
panda-compressed.png 由项目当前未修改的 encodeSmartPng 函数生成，使用 UPNG.js 2.1.0、最多 256 色，再经过 @jsquash/oxipng 2.3.0 level 2 优化。颜色量化属于有损处理，尺寸仍为 1296 × 864。效果图没有额外模糊原图或增强结果。

Both derived PNGs are shared under CC BY-SA 4.0. Reuse of these photographs or derivatives must preserve the attribution, license link, modification notice, and applicable ShareAlike obligations. This license notice applies to the photograph and its derivatives, not to unrelated project branding or UI assets.
两个派生 PNG 均沿用 CC BY-SA 4.0。复用摄影作品或派生素材时，请保留作者署名、许可链接和修改说明，并遵守相同方式共享要求。该许可针对照片及其派生内容，不代表项目品牌和其他 UI 资产的许可。

Measured bytes / 实测体积
panda-original.png:   1,823,620 bytes (1.82 MB)
panda-compressed.png:   561,218 bytes (561.2 KB)
Reduction: 69.22505785196478% (displayed as 69.2%)
Display units: decimal, 1 KB = 1,000 bytes; 1 MB = 1,000,000 bytes.
See case-measurements.json for hashes and detailed measurements.