Bytescout.Watermarking SDK is a native .NET library to mark image files (JPG, PNG, GIF and other) with text, text annotations and logo images within your .NET desktop or web-application.
Benefits:
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built-in set of ready-to-use 15 watermark types: TextFitsPage, TextFitsPageDiagonal, SimpleText, SimpleVerticalText, TiledText, TiledTextVertical, TiledTextDiagonal, Stamp, StampFitsPage, StampFitsPageDiagonal, TextAnnotation, LogoImage, LogoWithText;
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EXIF and photo information macros support in text for watermarks (file and EXIF information) (see sample code) , see full list of supported EXIF macros
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adjustable transparency for text and logo images;
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customizable font settings, text location, rotation, margins and other;
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supports batch watermarking for image files;
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provides ability to process pictures using stream-to-stream operation (for ASP.NET/ASP web-applications);
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made with 100% managed code;