c# 设置水印,消除水印

方案1:

图像处理

opencv etc

方案2:

开源框架,直接使用,已经优化

https://github.com/itext/itextsharp
https://github.com/itext/itext7-dotnet
https://github.com/itext/i7n-pdfsweep

https://github.com/itext/itextsharp/releases/tag/5.5.13

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