Add Image stamps in PDF programmatically

Add Image Stamp in PDF File

You can use the ImageStamp class to add an image stamp to a PDF file. The ImageStamp class provides the properties necessary for creating an image-based stamp, such as height, width, opacity and so on.

To add an image stamp:

1. Create a Document object and an ImageStamp object using required properties.
2. Call the Page class AddStamp method to add the stamp to the PDF.

The following code snippet shows how to add image stamp in the PDF file.

using namespace System;
using namespace Aspose::Pdf;
using namespace Aspose::Pdf::Text;

void AddImageStampToPDFFile()
{    
    String _dataDir("C:\\Samples\\");

    // String for input file name
    String inputFileName("AddImageStamp.pdf");

    String outputFileName("AddImageStamp_out.pdf");

    // Open document
    auto document = MakeObject<Document>(_dataDir + inputFileName);

    // Create image stamp
    auto imageStamp = MakeObject<ImageStamp>(_dataDir + u"aspose-logo.jpg");
    imageStamp->set_Background(true);
    imageStamp->set_XIndent(100);
    imageStamp->set_YIndent(100);
    imageStamp->set_Height(48);
    imageStamp->set_Width(225);
    imageStamp->set_Rotate(Rotation::on270);
    imageStamp->set_Opacity(0.5);
   
    // Add stamp to particular page    
    document->get_Pages()->idx_get(1)->AddStamp(imageStamp);

    // Save output document
    document->Save(_dataDir + outputFileName);
}

Control Image Quality when Adding Stamp

When adding an image as a stamp object, you can control the quality of the image. The Quality property of the ImageStamp class is used for this purpose. It indicates the quality of image in percents (valid values are 0..100).

void ControlImageQualityWhenAddingStamp() {
    
    String _dataDir("C:\\Samples\\");

    // String for input file name
    String inputFileName("AddImageStamp.pdf");
    String outputFileName("ControlImageQuality_out.pdf");

    // Open document
    auto document = MakeObject<Document>(_dataDir + inputFileName);

    // Create image stamp
    auto imageStamp = MakeObject<ImageStamp>(_dataDir + u"aspose-logo.jpg");

    imageStamp->set_Quality(10);
    document->get_Pages()->idx_get(1)->AddStamp(imageStamp);    
    document->Save(_dataDir + u"ControlImageQuality_out.pdf");
}

Image Stamp as Background in Floating Box

Aspose.PDF API lets you add image stamp as background in a floating box. The BackgroundImage property of FloatingBox class can be used to set the background image stamp for a floating box as shown in following code sample.

void ImageStampAsBackgroundInFloatingBox() {
    
    String _dataDir("C:\\Samples\\");

    // String for input file name
    String inputFileName("AddImageStamp.pdf");
    String outputFileName("AddImageStampAsBackgroundInFloatingBox_out.pdf");

    // Instantiate Document object
    auto document = MakeObject<Document>();

    // Add page to PDF document
    auto page = document->get_Pages()->Add();

    // Create FloatingBox object
    auto aBox = MakeObject<FloatingBox>(200, 100);

    // Set left position for FloatingBox
    aBox->set_Left(40);
    // Set Top position for FloatingBox
    aBox->set_Top(80);
    // Set the Horizontal alignment for FloatingBox
    aBox->set_HorizontalAlignment(HorizontalAlignment::Center);
    
    // Add text fragment to paragraphs collection of FloatingBox    
    aBox->get_Paragraphs()->Add(MakeObject<TextFragment>(u"main text"));

    // Set border for FloatingBox
    aBox->set_Border(MakeObject<BorderInfo>(BorderSide::All, Color::get_Red()));

    // Add background image
    auto image = MakeObject<Image>();
    image->set_File(_dataDir + u"aspose-logo.png");
    aBox->set_BackgroundImage(image);

    // Set background color for FloatingBox
    aBox->set_BackgroundColor(Color::get_Yellow());

    // Add FloatingBox to paragraphs collection of page object
    page->get_Paragraphs()->Add(aBox);
    // Save the PDF document
    document->Save(_dataDir + outputFileName);
}