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[分享创造] 利用 PNG 图片的 alpha 通道，让深色模式浅色模式显示不同的内容

发表于
https://imgoverlay.pages.dev/
当前只能把图片变成灰色，再叠加。其他的单色应该也可以，如果图片内容特殊，应该也可以是彩色内容，没想到好的办法。
纯前端实现的，放在了一个 html 文件里。大部分代码是 AI 帮忙写的，凑合能用
比如我的头像，就叠加了两个图片

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