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将用户上传的图片背景去掉，输出透明背景的 PNG。适用于棋盘格/双色背景：先从边缘像素聚类得到两种背景色，再用 ImageMagick 的连通 floodfill 将背景变为透明。
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Showing SKILL.md
| name | transparent-png |
| description | 将用户上传的图片背景去掉，输出透明背景的 PNG。适用于棋盘格/双色背景：先从边缘像素聚类得到两种背景色，再用 ImageMagick 的连通 floodfill 将背景变为透明。 |
| allowed-tools | ["exec","read","write"] |
把一张图片的背景去掉，得到透明背景的 PNG。
magick 命令可用sudo apt-get install -y python3-pil# 默认 fuzz=25
bash $SKILL_DIR/run.sh -i input.png -o output.png
# 手动调 fuzz
bash $SKILL_DIR/run.sh -i input.png -o output.png --fuzz 20
bash $SKILL_DIR/run.sh -i input.png -o output.png --fuzz 30
--fuzz 调大（例如 25 → 30/35）--fuzz 调小（例如 25 → 20/15）scripts/bg2colors.py 从图像四边采样像素，K=2 聚类得到两种背景代表色run.sh 调用 magick：对 8 个边界种子点分别用两种颜色做 alpha floodfill，只把连通背景置为透明Based on SOC occupation classification
