Manage Slide Masters in Aspose.Slides for .NET: create, edit and apply layouts, themes and placeholders to PPT, PPTX and ODP with concise C# examples.... Add ( 0 , Color . FromArgb ( 255 , 0 , 0 ));...GradientStops . Add ( 255 , Color . FromArgb ( 128 , 0 , 128 ));...