Adding image watermarks Leave feedback
GroupDocs.Watermark API supports adding the following image file types as image watermark:
- BMP;
- PNG;
- GIF;
- JPEG.
The following code snippet shows how to add ImageWatermark to a document. If the document consists of multiple parts (pages, worksheets, slides, frames, etc.), the watermark will be added to each of them.
AdvancedUsage.AddingImageWatermarks.AddImageWatermark
// Specify an absolute or relative path to your document. Ex: @"C:\Docs\presentation.pptx"
using (Watermarker watermarker = new Watermarker("presentation.pptx"))
{
// Use path to the image as constructor parameter
using (ImageWatermark watermark = new ImageWatermark("watermark.jpg"))
{
// Add watermark to the document
watermarker.Add(watermark);
watermarker.Save("presentation.pptx");
}
}
You can also use a stream of the image to initialize ImageWatermark instance as shown in below example.
AdvancedUsage.AddingImageWatermarks.AddImageWatermarkUsingStream
// Specify an absolute or relative path to the watermark image. Ex: @"C:\Docs\watermark.jpg"
using (Stream watermarkStream = File.OpenRead("watermark.jpg"))
{
using (Watermarker watermarker = new Watermarker("image.png"))
{
// Use stream containing an image as constructor parameter
using (ImageWatermark watermark = new ImageWatermark(watermarkStream))
{
// Add watermark to the document
watermarker.Add(watermark);
watermarker.Save("image.png");
}
}
}
WarningThe ImageWatermark class implements an IDisposable interface. Therefore, it is necessary to call the Dispose method when you are done working with the watermark. Alternatively, you can use the using statement.
For the advanced use of image watermark properties please check the following article about text watermarks, however, the same techniques will work for image watermarks as well:
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