Ekstrak Gambar dari File PDF

Menggunakan sumber daya halaman

Potongan kode berikut juga berfungsi dengan pustaka Aspose.PDF.Drawing.

Gambar disimpan dalam koleksi Resources setiap halaman di koleksi Images. Untuk mengekstrak halaman tertentu, ambil gambar dari koleksi Images menggunakan indeks gambar tertentu.

Indeks gambar mengembalikan objek XImage. Objek ini menyediakan metode Save untuk menyimpan gambar yang diekstrak. Potongan kode berikut menunjukkan cara mengekstrak gambar dari file PDF.

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void ExtractImageFromPDF()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "ExtractImages.pdf"))
    {
        // Extract a particular image
        var xImage = document.Pages[1].Resources.Images[1];
        using (var outputImage = new FileStream(dataDir + "ExtractedImage.jpg", FileMode.Create))
        {
            // Save PDF document image
            xImage.Save(outputImage, System.Drawing.Imaging.ImageFormat.Jpeg);
        }

        // Save PDF document
        document.Save(dataDir + "ExtractImages_out.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void ExtractImageFromPDF()
{
    // The path to the documents directory
    string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Open PDF document
    using var document = new Aspose.Pdf.Document(dataDir + "ExtractImages.pdf");

    // Get the first image from the first page
    var xImage = document.Pages[1].Resources.Images[1];

    using var outputImage = File.Create(dataDir + "ExtractedImage.jpg");

    // Save PDF document image
    xImage.Save(outputImage, System.Drawing.Imaging.ImageFormat.Jpeg);

    // Save PDF document
    document.Save(dataDir + "ExtractImages_out.pdf");
}

Menggunakan ImagePlacementAbsorber

Dengan rilis Aspose.PDF for .NET 7.0.0, kami memperkenalkan kelas yang disebut ImagePlacement, ImagePlacementAbsorber dan ImagePlacementCollection yang memberikan kemampuan serupa seperti kelas yang dijelaskan di atas untuk mendapatkan resolusi dan posisi gambar dalam dokumen PDF.

• ImagePlacementAbsorber melakukan pencarian penggunaan gambar seperti koleksi objek ImagePlacement.
• ImagePlacement menyediakan anggota Resolution dan Rectangle yang mengembalikan nilai penempatan gambar yang sebenarnya.

Potongan kode berikut juga berfungsi dengan pustaka Aspose.Drawing.

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void ExtractAndScaleImagesFromPDF()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_Images();

    int imageCount = 0;

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "ImagePlacement.pdf"))
    {
        var abs = new Aspose.Pdf.ImagePlacementAbsorber();

        // Load the contents of the first page
        document.Pages[1].Accept(abs);

        // Iterate through each image placement on the first page
        foreach (var imagePlacement in abs.ImagePlacements)
        {
            // Get image properties
            Console.Out.WriteLine("image width: " + imagePlacement.Rectangle.Width);
            Console.Out.WriteLine("image height: " + imagePlacement.Rectangle.Height);
            Console.Out.WriteLine("image LLX: " + imagePlacement.Rectangle.LLX);
            Console.Out.WriteLine("image LLY: " + imagePlacement.Rectangle.LLY);
            Console.Out.WriteLine("image horizontal resolution: " + imagePlacement.Resolution.X);
            Console.Out.WriteLine("image vertical resolution: " + imagePlacement.Resolution.Y);

            // Extract a particular image
            using (var outputImage = new FileStream(dataDir + "ExtractedImage_" + imageCount.ToString() + ".jpg", FileMode.Create))
            {
                // Save PDF document image
                imagePlacement.Save(outputImage, System.Drawing.Imaging.ImageFormat.Jpeg);
            }

            ++imageCount;
        }
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void ExtractAndScaleImagesFromPDF()
{
    // The path to the documents directory
    string dataDir = RunExamples.GetDataDir_AsposePdf_Images();
    int imageCount = 0;

    // Open PDF document
    using var document = new Aspose.Pdf.Document(dataDir + "ImagePlacement.pdf");
    var absorber = new Aspose.Pdf.ImagePlacementAbsorber();

    // Load contents of the first page
    document.Pages[1].Accept(absorber);

    // Iterate through each image placement on the first page
    foreach (var imagePlacement in absorber.ImagePlacements)
    {
        Console.WriteLine($"Image {imageCount}:");
        Console.WriteLine($"  Width: {imagePlacement.Rectangle.Width}");
        Console.WriteLine($"  Height: {imagePlacement.Rectangle.Height}");
        Console.WriteLine($"  LLX: {imagePlacement.Rectangle.LLX}");
        Console.WriteLine($"  LLY: {imagePlacement.Rectangle.LLY}");
        Console.WriteLine($"  Horizontal Resolution: {imagePlacement.Resolution.X}");
        Console.WriteLine($"  Vertical Resolution: {imagePlacement.Resolution.Y}");

        using var outputImage = File.Create(dataDir + $"ExtractedImage_{imageCount}.jpg");
        // Save PDF document image
        imagePlacement.Save(outputImage, System.Drawing.Imaging.ImageFormat.Jpeg);

        ++imageCount;
    }
}