提取图像并更改印章位置

从图像印章中提取图像

PdfContentEditor 类允许您从 PDF 文件中的印章提取图像。首先，您需要创建一个 PdfContentEditor 类的对象，并使用 BindPdf 方法绑定输入 PDF 文件。之后，调用 GetStamps 方法从 PDF 文件的特定页面获取 StampInfo 对象数组。然后，您可以使用 StampInfo.Image 属性从 StampInfo 中获取图像。一旦获取图像，您可以保存图像或处理图像的不同属性。以下代码片段演示了如何从图像印章中提取图像。

.NET Core 3.1

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

    // Instantiate PdfContentEditor object
    using (var pdfContentEditor = new Aspose.Pdf.Facades.PdfContentEditor())
    {
        // Bind PDF document
        pdfContentEditor.BindPdf(dataDir + "ExtractImage-ImageStamp.pdf");

        // Get Stamp info for the first stamp
        var infos = pdfContentEditor.GetStamps(1);

        // Get the image from Stamp Info
        var image = infos[0].Image;

        // Save the extracted image
        image.Save(dataDir + "image_out.jpg");
    }
}

.NET 8

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

    // Instantiate PdfContentEditor object
    using var pdfContentEditor = new Aspose.Pdf.Facades.PdfContentEditor();

    // Bind PDF document
    pdfContentEditor.BindPdf(dataDir + "ExtractImage-ImageStamp.pdf");

    // Get Stamp info for the first stamp
    var infos = pdfContentEditor.GetStamps(1);

    // Get the image from Stamp Info
    var image = infos[0].Image;

    // Save the extracted image
    image.Save(dataDir + "image_out.jpg");
}

更改 PDF 文件中印章的位置

PdfContentEditor 类允许您更改 PDF 文件中印章的位置。首先，您需要创建一个 PdfContentEditor 类的对象，并使用 BindPdf 方法绑定输入 PDF 文件。之后，调用 MoveStamp 方法，传入印章索引和 PDF 文件特定页面上的新位置。然后，您可以使用 Save 方法保存更新后的文件。以下代码片段演示了如何在特定页面中移动印章。

.NET Core 3.1

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

    // Instantiate PdfContentEditor object
    using (var pdfContentEditor = new Aspose.Pdf.Facades.PdfContentEditor())
    {
        // Bind PDF document
        pdfContentEditor.BindPdf(dataDir + "ChangeStampPosition.pdf");

        int pageId = 1;
        int stampIndex = 1;
        double x = 200;
        double y = 200;

        // Change the position of the stamp to new x and y position
        pdfContentEditor.MoveStamp(pageId, stampIndex, x, y);

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

.NET 8

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

    // Instantiate PdfContentEditor object
    using var pdfContentEditor = new Aspose.Pdf.Facades.PdfContentEditor();

    // Bind PDF document
    pdfContentEditor.BindPdf(dataDir + "ChangeStampPosition.pdf");

    int pageId = 1;
    int stampIndex = 1;
    double x = 200;
    double y = 200;

    // Change the position of the stamp to new x and y position
    pdfContentEditor.MoveStamp(pageId, stampIndex, x, y);

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

此外，您还可以使用 MoveStampById 方法通过使用 StampId 移动特定印章。

.NET Core 3.1

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

    // Instantiate PdfContentEditor Object
    using (var pdfContentEditor = new Aspose.Pdf.Facades.PdfContentEditor())
    {
        // Bind PDF document
        pdfContentEditor.BindPdf(dataDir + "ChangeStampPosition.pdf");

        int pageId = 1;
        int stampId = 1;
        double x = 200;
        double y = 200;

        // Change the position of the stamp to new x and y position
        pdfContentEditor.MoveStamp(pageId, stampId, x, y);

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

.NET 8

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

    // Instantiate PdfContentEditor Object
    using var pdfContentEditor = new Aspose.Pdf.Facades.PdfContentEditor();

    // Bind PDF document
    pdfContentEditor.BindPdf(dataDir + "ChangeStampPosition.pdf");

    int pageId = 1;
    int stampId = 1;
    double x = 200;
    double y = 200;

    // Change the position of the stamp to new x and y position
    pdfContentEditor.MoveStamp(pageId, stampId, x, y);

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