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hello i need add multi watermark (cmyk) in a background and save cmyk using c#. need source or code for create program convert multi image in background and save cmyk. just save cmyk because for print picture just is cmyk color.
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You could use some third parties to add a watermark for e.g. How to programmatically add a WATERMARK to PDF documents[^].
You could also try - Build a Simple Watermarking Utility in C#[^].
 
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hi i need save picture cmyk.
your link save picture rgb.

so can you help me at save cmyk format color?
 
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