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huangyz0918 avatar huangyz0918 commented on June 2, 2024

截屏相当于加了一层滤镜，破坏了隐藏在空间域像素中的冗余信息。

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howtoplay avatar howtoplay commented on June 2, 2024

截屏相当于加了一层滤镜，破坏了隐藏在空间域像素中的冗余信息。

先截屏，再加水印，此时获取的回调中的Bitmap是可以解析的，但是将Bitmap保存为图片之后再将图片拿出来解析就解析不出来了，这是为什么？

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yhonet avatar yhonet commented on June 2, 2024

LSB算法是利用每个像素各个颜色值的最低位来存储水印的，因此天生抗干扰能力弱。即使是最简单的旋转、剪切、调色、压缩等等会修改像素位置或者颜色值的操作就会破坏水印的数据。更不要说另外拿个相机对着屏幕拍下来再另存了。要对抗这些破坏水印的操作得用别的水印算法。

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