Install-Package Spire.Presentation

using Spire.Presentation;
using Spire.Presentation.Drawing;
using System.IO;
 
namespace ExtractSlideBackgroundImages
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // 指定輸入文件路徑和輸出文件夾
            string inputFile = @"example1.pptx";
            string outputFolder = @"ExtractedBackgrounds\Slides";
 
            // 加載 PowerPoint 演示文稿
            Presentation presentation = new Presentation();
            presentation.LoadFromFile(inputFile);
 
            // 創(chuàng)建輸出文件夾
            Directory.CreateDirectory(outputFolder);
 
            // 遍歷所有幻燈片
            for (int i = 0; i < presentation.Slides.Count; i++)
            {
                // 判斷幻燈片背景填充類型是否為圖片
                var fill = presentation.Slides[i].SlideBackground.Fill;
                if (fill.FillType == FillFormatType.Picture)
                {
                    // 提取并保存背景圖片
                    var image = fill.PictureFill.Picture.EmbedImage;
                    if (image != null)
                    {
                        string outputPath = Path.Combine(outputFolder, $"SlideBackground_{i + 1}.png");
                        image.Image.Save(outputPath, ImageFormat.Png);
                    }
                }
            }
        }
    }
}

using Spire.Presentation;
using Spire.Presentation.Drawing;
using System.Drawing.Imaging;
using System.IO;
 
namespace ExtractBackgroundImages
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // 指定輸入文件路徑和輸出文件夾
            string inputFile = @"example2.pptx";
            string outputFolder = @"C:\ExtractedBackgrounds\Masters";
 
            // 加載 PowerPoint 演示文稿
            Presentation presentation = new Presentation();
            presentation.LoadFromFile(inputFile);
 
            // 創(chuàng)建輸出文件夾
            Directory.CreateDirectory(outputFolder);
 
            // 遍歷所有幻燈片母版
            for (int i = 0; i < presentation.Masters.Count; i++)
            {
                // 判斷幻燈片母版的背景填充類型是否為圖片
                var fill = presentation.Masters[i].SlideBackground.Fill;
                if (fill.FillType == FillFormatType.Picture)
                {
                    // 提取并保存背景圖片
                    var image = fill.PictureFill.Picture.EmbedImage;
                    if (image != null)
                    {
                        string outputPath = Path.Combine(outputFolder, $"MasterBackground_{i + 1}.png");
                        image.Image.Save(outputPath, ImageFormat.Png);
                    }
                }
            }
        }
    }
}