The example demonstrates how to use blend modes – a way how intersecting semi-transparent objects will blend on page canvas using ByteScout PDF SDK.

Program.vb:
VB

'*******************************************************************
'       ByteScout PDF SDK
'                                                                   
'       Copyright © 2016 Bytescout, http://www.bytescout.com        
'       ALL RIGHTS RESERVED                                         
'                                                                   
'*******************************************************************

Imports Bytescout.PDF

''' <summary>
''' This example demonstrates how to use blend modes - a way how 
''' intersecting semi-transparent objects will blend on page canvas.
''' </summary>
Class Program

    Shared Sub Main()

        ' Create new document
        Dim pdfDocument = New Document()
        pdfDocument.RegistrationName = "demo"
		pdfDocument.RegistrationKey = "demo"
        ' Add page
        Dim page = New Page(PaperFormat.A4)
        pdfDocument.Pages.Add(page)

        Dim canvas = page.Canvas

        ' Create transparent brushes
        Dim brushRed = New SolidBrush(New ColorRGB(255, 0, 0))
        brushRed.Opacity = 50
        Dim brushGreen = New SolidBrush(New ColorRGB(0, 255, 0))
        brushGreen.Opacity = 50
        Dim brushBlue = New SolidBrush(New ColorRGB(0, 0, 255))
        brushBlue.Opacity = 50

        ' Normal blending
        canvas.BlendMode = BlendMode.Normal
        canvas.DrawCircle(brushRed, 100, 100, 50)
        canvas.DrawCircle(brushGreen, 100, 150, 50)
        canvas.DrawCircle(brushBlue, 150, 100, 50)

        ' Darken blending
        canvas.BlendMode = BlendMode.Darken
        canvas.DrawCircle(brushRed, 300, 100, 50)
        canvas.DrawCircle(brushGreen, 300, 150, 50)
        canvas.DrawCircle(brushBlue, 350, 100, 50)

        ' Lighten blending
        canvas.BlendMode = BlendMode.Lighten
        canvas.DrawCircle(brushRed, 100, 300, 50)
        canvas.DrawCircle(brushGreen, 100, 350, 50)
        canvas.DrawCircle(brushBlue, 150, 300, 50)

        ' Color burn blending
        canvas.BlendMode = BlendMode.ColorBurn
        canvas.DrawCircle(brushRed, 300, 300, 50)
        canvas.DrawCircle(brushGreen, 300, 350, 50)
        canvas.DrawCircle(brushBlue, 350, 300, 50)

        ' Save document to file
        pdfDocument.Save("result.pdf")

        ' Cleanup 
		pdfDocument.Dispose()

        ' Open document in default PDF viewer app
        Process.Start("result.pdf")

    End Sub

End Class 

Program.cs:
C#

//*******************************************************************
//       ByteScout PDF SDK		                                     
//                                                                   
//       Copyright © 2016 ByteScout - http://www.bytescout.com       
//       ALL RIGHTS RESERVED                                         
//                                                                   
//*******************************************************************

using System.Diagnostics;
using Bytescout.PDF;

namespace BlendModeExample
{
	/// <summary>
	/// This example demonstrates how to use blend modes - a way how 
	/// intersecting semi-transparent objects will blend on page canvas.
	/// </summary>
	class Program
	{
		static void Main()
		{
			// Create new document
			Document pdfDocument = new Document();
			pdfDocument.RegistrationName = "demo";
			pdfDocument.RegistrationKey = "demo";
			// Add page
			Page page = new Page(PaperFormat.A4);
			pdfDocument.Pages.Add(page);

			Canvas canvas = page.Canvas;

			// Create transparent brushes
			SolidBrush brushRed = new SolidBrush(new ColorRGB(255, 0, 0));
			brushRed.Opacity = 50;
			SolidBrush brushGreen = new SolidBrush(new ColorRGB(0, 255, 0));
			brushGreen.Opacity = 50;
			SolidBrush brushBlue = new SolidBrush(new ColorRGB(0, 0, 255));
			brushBlue.Opacity = 50;

			// Normal blending
			canvas.BlendMode = BlendMode.Normal;
			canvas.DrawCircle(brushRed, 100, 100, 50);
			canvas.DrawCircle(brushGreen, 100, 150, 50);
			canvas.DrawCircle(brushBlue, 150, 100, 50);

			// Darken blending
			canvas.BlendMode = BlendMode.Darken;
			canvas.DrawCircle(brushRed, 300, 100, 50);
			canvas.DrawCircle(brushGreen, 300, 150, 50);
			canvas.DrawCircle(brushBlue, 350, 100, 50);

			// Lighten blending
			canvas.BlendMode = BlendMode.Lighten;
			canvas.DrawCircle(brushRed, 100, 300, 50);
			canvas.DrawCircle(brushGreen, 100, 350, 50);
			canvas.DrawCircle(brushBlue, 150, 300, 50);

			// Color burn blending
			canvas.BlendMode = BlendMode.ColorBurn;
			canvas.DrawCircle(brushRed, 300, 300, 50);
			canvas.DrawCircle(brushGreen, 300, 350, 50);
			canvas.DrawCircle(brushBlue, 350, 300, 50);

			// Save document to file
			pdfDocument.Save("result.pdf");

			// Cleanup 
			pdfDocument.Dispose();

			// Open document in default PDF viewer app
			Process.Start("result.pdf");
		}
	}
}