Adding watermark to images inside a document
The most of the document formats allow you to place images inside a document. If you want to add watermark to images inside a document then it can be possible using GroupDocs.Watermark. Following are the steps to add watermark to the images of any document.
- Load the document
- Create and initialize watermark object
- Set watermark properties
- Find images in the document
- Add watermark to all found images
- Save the document
AdvancedUsage.AddingWatermarks.AddWatermarksToImages.AddWatermarkToImagesInsideDocument
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: @"C:\Docs\document.pdf"
using (Watermarker watermarker = new Watermarker(Constants.InDocumentPdf))
{
// Initialize text watermark
TextWatermark textWatermark = new TextWatermark("Protected image", new Font("Arial", 8));
textWatermark.HorizontalAlignment = HorizontalAlignment.Center;
textWatermark.VerticalAlignment = VerticalAlignment.Center;
textWatermark.RotateAngle = 45;
textWatermark.SizingType = SizingType.ScaleToParentDimensions;
textWatermark.ScaleFactor = 1;
// Initialize image watermark
using (ImageWatermark imageWatermark = new ImageWatermark(Constants.ProtectJpg))
{
imageWatermark.HorizontalAlignment = HorizontalAlignment.Center;
imageWatermark.VerticalAlignment = VerticalAlignment.Center;
imageWatermark.RotateAngle = -45;
imageWatermark.SizingType = SizingType.ScaleToParentDimensions;
imageWatermark.ScaleFactor = 1;
// Find all images in a document
WatermarkableImageCollection images = watermarker.GetImages();
for (int i = 0; i < images.Count; i++)
{
if (images[i].Width > 100 && images[i].Height > 100)
{
if (i % 2 == 0)
{
images[i].Add(textWatermark);
}
else
{
images[i].Add(imageWatermark);
}
}
}
}
watermarker.Save(Constants.OutDocumentPdf);
}
More resources
GitHub examples
You may easily run the code above and see the feature in action in our GitHub examples:
Free online document watermarking App
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You are welcome to add watermark to PDF, DOC, DOCX, PPT, PPTX, XLS, XLSX, Emails and more with our free online Free Online Document Watermarking App.