Install-Package Spire.PDF

using Spire.Pdf;
using Spire.Pdf.Graphics;
using System.Drawing;
using System.IO;

using Spire.Pdf;
using Spire.Pdf.Graphics;
using System;
using System.Drawing;
using System.IO;

class ExtractPdfImages
{
    static void Main()
    {
        // 加載 PDF 文件
        PdfDocument pdf = new PdfDocument();
        pdf.LoadFromFile("Sample.pdf");

        int imageIndex = 1;

        // 遍歷每一頁(yè)
        foreach (PdfPageBase page in pdf.Pages)
        {
            // 使用 PdfImageHelper 獲取頁(yè)面上的所有圖片信息
            PdfImageInfo[] images = PdfImageHelper.GetImages(page);

            foreach (PdfImageInfo info in images)
            {
                // 提取圖片對(duì)象
                Image img = info.Image;

                // 保存為獨(dú)立文件
                string fileName = $"Image_{imageIndex}.png";
                img.Save(fileName, System.Drawing.Imaging.ImageFormat.Png);

                Console.WriteLine($"已提取圖片: {fileName}");
                imageIndex++;
            }
        }

        Console.WriteLine("PDF 圖片提取完成！");
    }
}

PdfPageBase firstPage = pdf.Pages[0];
PdfImageInfo[] firstPageImages = PdfImageHelper.GetImages(firstPage);