Working with slide backgrounds Leave feedback
The API allows you to extract information about all the slide backgrounds, Removing a particular background and Adding watermark to all background images
The API allows you to extract information about all the slide backgrounds in a PowerPoint document as shown in the following code sample using property BackgroundImage of PresentationSlide.ImageFillFormat.
AdvancedUsage.AddingWatermarks.AddWatermarksToPresentations.PresentationGetSlideBackgroundsInformation
PresentationLoadOptions loadOptions = new PresentationLoadOptions();
// Specify an absolute or relative path to your document. Ex: @"C:\Docs\presentation.pptx"
using (Watermarker watermarker = new Watermarker("presentation.pptx", loadOptions))
{
PresentationContent content = watermarker.GetContent<PresentationContent>();
foreach (PresentationSlide slide in content.Slides)
{
if (slide.ImageFillFormat.BackgroundImage != null)
{
Console.WriteLine(slide.ImageFillFormat.BackgroundImage.Width);
Console.WriteLine(slide.ImageFillFormat.BackgroundImage.Height);
Console.WriteLine(slide.ImageFillFormat.BackgroundImage.GetBytes().Length);
}
}
}
Following code sample shows how to remove the background image of a particular slide setting the property BackgroundImage to null.
AdvancedUsage.AddingWatermarks.
PresentationLoadOptions loadOptions = new PresentationLoadOptions();
// Specify an absolute or relative path to your document. Ex: @"C:\Docs\presentation.pptx"
using (Watermarker watermarker = new Watermarker("presentation.pptx", loadOptions))
{
PresentationContent content = watermarker.GetContent<PresentationContent>();
content.Slides[0].ImageFillFormat.BackgroundImage = null;
watermarker.Save("presentation.pptx");
}
Using GroupDocs.Watermark, you can also add watermark to the background images that belong to a PowerPoint document as shown in the following code sample.
AdvancedUsage.AddingWatermarks.
PresentationLoadOptions loadOptions = new PresentationLoadOptions();
// Specify an absolute or relative path to your document. Ex: @"C:\Docs\presentation.pptx"
using (Watermarker watermarker = new Watermarker("presentation.pptx", loadOptions))
{
// Initialize image or text watermark
TextWatermark watermark = new TextWatermark("Protected image", new Font("Arial", 8));
watermark.HorizontalAlignment = HorizontalAlignment.Center;
watermark.VerticalAlignment = VerticalAlignment.Center;
watermark.RotateAngle = 45;
watermark.SizingType = SizingType.ScaleToParentDimensions;
watermark.ScaleFactor = 1;
PresentationContent content = watermarker.GetContent<PresentationContent>();
foreach (PresentationSlide slide in content.Slides)
{
if (slide.ImageFillFormat.BackgroundImage != null)
{
// Add watermark to the image
slide.ImageFillFormat.BackgroundImage.Add(watermark);
}
}
watermarker.Save("presentation.pptx");
}
GroupDocs.Watermark for .NET also provides the feature that allows you to tile the picture across slide’s background. You can also make the image semi-transparent. Following code sample serves this purpose.
AdvancedUsage.AddingWatermarks.
PresentationLoadOptions loadOptions = new PresentationLoadOptions();
// Specify an absolute or relative path to your document. Ex: @"C:\Docs\presentation.pptx"
using (Watermarker watermarker = new Watermarker("presentation.pptx", loadOptions))
{
PresentationContent content = watermarker.GetContent<PresentationContent>();
PresentationSlide slide = content.Slides[0];
slide.ImageFillFormat.BackgroundImage =
new PresentationWatermarkableImage(File.ReadAllBytes("background.png"));
slide.ImageFillFormat.TileAsTexture = true;
slide.ImageFillFormat.Transparency = 0.5;
watermarker.Save("presentation.pptx");
}
GroupDocs.Watermark for .NET also allows you to set the background image for a chart inside PowerPoint document using Charts property. You can use following code sample to achieve this functionality.
AdvancedUsage.AddingWatermarks.
PresentationLoadOptions loadOptions = new PresentationLoadOptions();
// Specify an absolute or relative path to your document. Ex: @"C:\Docs\presentation.pptx"
using (Watermarker watermarker = new Watermarker("presentation.pptx", loadOptions))
{
PresentationContent content = watermarker.GetContent<PresentationContent>();
content.Slides[0].Charts[0].ImageFillFormat.BackgroundImage =
new PresentationWatermarkableImage(File.ReadAllBytes("test.png"));
content.Slides[0].Charts[0].ImageFillFormat.Transparency = 0.5;
content.Slides[0].Charts[0].ImageFillFormat.TileAsTexture = true;
watermarker.Save("presentation.pptx");
}
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