using System; using System.Drawing; using Aspose.Slides; using Aspose.Slides.Export; namespace SlidesWatermark { class Program { static void Main(string[] args) { string PathForWatermarkPptFile = @"Y:\Downloads\"; License license = new License(); license.SetLicense(PathForWatermarkImageFile + "Conholdate.Total.Product.Family.lic"); //Load the presentation to insert watermark Presentation WatermarkPptxPresentation = new Presentation(PathForWatermarkPptFile + "PictureWatermark.pptx"); // Loading watermark image to add in PPTX System.Drawing.Image WatermarkLogo = (System.Drawing.Image)new Bitmap("Picture Watermark Logo.jpg"); IPPImage WatermarkImage = WatermarkPptxPresentation.Images.AddImage(WatermarkLogo); //Accessing the master slides for adding watermark image foreach (IMasterSlide masterSlide in WatermarkPptxPresentation.Masters) { //Adding a Ppt watermark shape for logo image IPictureFrame PptxWatermark = masterSlide.Shapes.AddPictureFrame(ShapeType.Rectangle,0, 0, 200, 50, WatermarkImage); //Set the rotation angle of the shape PptxWatermark.Rotation = 325; //Lock Pptx watermark image shape for protection in PowerPoint PptxWatermark.ShapeLock.SizeLocked = true; PptxWatermark.ShapeLock.SelectLocked = true; PptxWatermark.ShapeLock.PositionLocked = true; } //Saving the image watermark PPTX presentation file WatermarkPptxPresentation.Save(PathForWatermarkPptFile + "ImageWatermarkedPresentation.pptx", SaveFormat.Pptx); } } }