C#/VB.NET: PDF를 이미지(JPG, PNG, BMP)로 변환

PM> Install-Package Spire.PDF 

using Spire.Pdf;
    using Spire.Pdf.Graphics;
    using System.Drawing;
    using System.Drawing.Imaging;
    
    namespace PDFtoImage
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument instance
                PdfDocument pdf = new PdfDocument();
    
                //Load a sample PDF document
                pdf.LoadFromFile("E:\\Files\\input.pdf");
    
                //Convert the first page to an image and set the image Dpi
                Image image = pdf.SaveAsImage(0, PdfImageType.Bitmap, 500, 500);
    
                //Save the image as a JPG file
                image.Save("ToJPG.jpg", ImageFormat.Jpeg);
    
                //Save the image as a PNG file
                //image.Save("ToPNG.png", ImageFormat.Png);
    
                //Save the image as a BMP file
                //image.Save("ToBMP.bmp", ImageFormat.Bmp);
            }
        }
    }

Imports Spire.PDF
    Imports Spire.PDF.Graphics
    Imports System.Drawing
    Imports System.Drawing.Imaging
    
    
    Namespace PDFtoImage
        Class Program
            Private Shared Sub Main(ByVal args() As String)
    
                'Create a PdfDocument instance
                Dim pdf As PdfDocument = New PdfDocument
    
                'Load a sample PDF document
                pdf.LoadFromFile("E:\Files\input.pdf")
    
                'Convert the first page to an image and set the image Dpi
                Dim image As Image = pdf.SaveAsImage(0, PdfImageType.Bitmap, 500, 500)
    
                'Save the image as a JPG file
                image.Save("ToJPG.jpg", ImageFormat.Jpeg)
    
                'Save the image as a PNG file
                'image.Save("ToPNG.png", ImageFormat.Png);
    
                'Save the image as a BMP file
                'image.Save("ToBMP.bmp", ImageFormat.Bmp);
            End Sub
            End Class
        End Namespace

using Spire.Pdf;
    using Spire.Pdf.Graphics;
    using System;
    using System.Drawing;
    using System.Drawing.Imaging;
    
    namespace PDFtoImage
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument instance
                PdfDocument pdf = new PdfDocument();
    
                //Load a sample PDF document
                pdf.LoadFromFile("input.pdf");
    
                //Loop through each page in the PDF
                for (int i = 0; i < pdf.Pages.Count; i++)
                {
                    //Convert all pages to images and set the image Dpi
                    Image image = pdf.SaveAsImage(i, PdfImageType.Bitmap, 500, 500);
    
                    //Save images as PNG format to a specified folder
                    String file = String.Format("Image\\ToImage-{0}.png", i);
                    image.Save(file, ImageFormat.Png);
    
                }
            }
        }
    }

Imports Spire.PDF
    Imports Spire.PDF.Graphics
    Imports System.Drawing
    Imports System.Drawing.Imaging
    
    Namespace PDFtoImage
        Class Program
            Private Shared Sub Main(ByVal args() As String)
    
                'Create a PdfDocument instance
                Dim pdf As PdfDocument = New PdfDocument
    
                'Load a sample PDF document
                pdf.LoadFromFile("input.pdf")
    
                'Loop through each page in the PDF
                For i As Integer = 0 To pdf.Pages.Count - 1
    
                    'Convert all pages to images and set the image Dpi
                    Dim image As Image = pdf.SaveAsImage(i, PdfImageType.Bitmap, 500, 500)
    
                    'Save images as PNG format to a specified folder
                    Dim file As String = String.Format("Image\ToImage-{0}.png", i)
                    image.Save(file, ImageFormat.Png)
                Next
            End Sub
        End Class
    End Namespace