Set custom dpi in C# and .NET


Complete code

using System;
using System.IO;
using System.Collections;

namespace Sample
{
    class Sample
    {
        static void Main(string[] args)
        {
            // Before starting, we recommend to get a free 100-day key:
            // https://sautinsoft.com/start-for-free/
            
            // Apply the key here:
            // SautinSoft.PdfFocus.SetLicense("...");
			
            string pdfPath = Path.GetFullPath(@"..\..\..\Excel.pdf");
            string imagePath = "Result.png";
			
            SautinSoft.PdfFocus f = new SautinSoft.PdfFocus();
	    	
            f.OpenPdf(pdfPath);

            if (f.PageCount > 0)
            {
                //In most cases we recommend to set 200 dpi to decrease the image size and converting speed
                //Now set 300 dpi - very high quality
                f.ImageOptions.Dpi = 300;

                //Convert 1st page from PDF to image file
                f.ImageOptions.PageIndex = 0;

                if (f.ToImage(imagePath) == 0)
                {
                    // 0 - converting successfully                
                    // 2 - can't create output file, check the output path
                    // 3 - converting failed
                    System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(imagePath) { UseShellExecute = true });
                }
            }        
        }
    }
}

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Imports System
Imports System.IO
Imports System.Collections

Namespace Sample
	Friend Class Sample
		Shared Sub Main(ByVal args() As String)
			' Before starting, we recommend to get a free 100-day key:
			' https://sautinsoft.com/start-for-free/

			' Apply the key here:
			' SautinSoft.PdfFocus.SetLicense("...");

			Dim pdfPath As String = Path.GetFullPath("..\..\..\Excel.pdf")
			Dim imagePath As String = "Result.png"

			Dim f As New SautinSoft.PdfFocus()

			f.OpenPdf(pdfPath)

			If f.PageCount > 0 Then
				'In most cases we recommend to set 200 dpi to decrease the image size and converting speed
				'Now set 300 dpi - very high quality
				f.ImageOptions.Dpi = 300

				'Convert 1st page from PDF to image file
				f.ImageOptions.PageIndex = 0

				If f.ToImage(imagePath) = 0 Then
					' 0 - converting successfully                
					' 2 - can't create output file, check the output path
					' 3 - converting failed
					System.Diagnostics.Process.Start(New System.Diagnostics.ProcessStartInfo(imagePath) With {.UseShellExecute = True})
				End If
			End If
		End Sub
	End Class
End Namespace

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